Animalia
Classification
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- Animalia
Abakanicyathus Konyushkov, 1964
Abicyathus Jankauskas, 1972
Abomesi Simmonds, 1881-, 1882
Abos Rubtsov, 1980
Abreviata Travassos, 1920
Acanthichnus Hitchcock, 1858
Acanthinocyathidae
Acanthocassis He & Xie, 1989
Acanthocephala
Acanthochitina Eisenack, 1931
Acanthophorus Linstow, 1876
Acanthopyrgus Handfield, 1967
Acanthorhaphe Ksiazkiewicz, 1970
Acanthosentis Podder, 1941
Acanthosphaera Duan, 1984
Acanthostephanocephalus Kreis, 1960
Acanthostrongylus Travassos, 1937
Acanthoxynema Khera, 1956
Acanthoxyurus Sandground, 1928
Acanthurus Agassiz, 1846
Acarinocola Warren, 1941
Accordiichnus Manni, Nicosia & Nobili, 2000
Acephalodorylaimus Ahmad & Jairajpuri, 1982
Acervomicritina Nagy, 1989
Achanarraspis Anderson, Dunlop & Trewin, 2000
Acheilostoma Leiper, 1911
Achorocyathidae
Achorocyathus Yankauskas, 1965
Acidocharacus Qin & Ding, 1988
Ackertia Vaz, 1934
Acmochitina Tsegelnyuk, 1982
Acripes Matthew, 1909
Acrobelinema Khera, 1968
Acronema Rubtsov, 1978
Acrosquama Qian & Xiao, 1985
Acrozostron Orton Williams, 1981
Acryacanthus Müller, 1904
Actina Andrássy, 1964
Actinosalpinx Sokolov, 1962
Acugutturus Hunt, 1980
Aculeochrea Val'kov & Sysoev, 1970
Aculonchus Siddiqi, 1983
Acuminachites Qian & Yin, 1985
Adaecyathus Fonin, 1983
Adelphozion Osbeck, 1765
Adicimicritina Nagy, 1989
Adleronema Timm, 1967
Adolpholutzia Travassos, 1935
Aduncospiculum Giblin & Kaya, 1984
Adversella Jiang, 1982
Adyctia Valenciennes, 1860
Aegialospirina De Coninck, 1943
Aenigmenchus De Ley, Coomans & Geraert, 1994
Aenigmichus Hitchcock, 1865
Aequalodontium Smolanko & Belogurov, 1993
Aerotylenchus Fotedar & Handoo, 1979
Afiacyathus Voronin, 1962
Afractinca Vinciguerra & Clausi, 2000
Afrancylostoma Biocca & Le Roux, 1958
Africana Travassos, 1920
Afrina Brzeski, 1981
Afritylenchus Singbo-Ieden & Nesterov, 1988
Afrocarnoya Hunt, 1998
Afrochona Puylaert, 1973
Afrodera Wouts, 1985
Agamofilaria Stiles, 1907
Agamomeris Castellani & Chalmers, 1910
Agamomermis Stiles, 1903
Agamonematodum Diesing, 1861
Agamonematoideum Diesing, 1853
Agamospirura Henry & Sisoff, 1913
Agastrocyathus Debrenne, 1964
Agathochitina Tsegelnyuk, 1982
Agchisteus Parfitt, 1873
Agetocystis Zaslavskaya & Obut, 1984
Aglaopterixia Kloss, 1961
Agyrekocyathidae
Agyrekocyathus Konjuschkov, 1967
Aimitidae
Ajacicyathellus Debrenne, 1958
Ajacicyathidae
Akademiophyllidae
Akademiophyllum Radygin, 1965
Akaste Gistl, 1847
Akinereites Katto, 1964
Aksuglobulus Qian & Xiao, 1985
Alabamasauripus Hunt, Lucas & Lockley, 2004
Alafilaria Yates & Jorgenson, 1983
Alainchabaudia Mawson, 1968
Alaplectana Azim, 1931
Alaskacoscinus Debrenne, Gangloff & Zhuravlev, 1990
Alataucyathidae
Alataucyathus Zhuravleva, 1955
Albertasuchipes McCrea, Pemberton & Currie, 2004
Albumares Fedonkin, 1976
Albumaresidae
Alcedospirura Oshmarin, 1959
Alcifilaria Oshmarin & Bielous, 1951
Alconeracyathus Perejon, 1973
Aldania Vassiljeva, 1985
Aldanocyathus Voronin, 1971
Aldanospina Missarjevsky, 1989
Alexandricyathus Kashina, 1979
Algoanema Heyns & Furstenberg, 1987
Aliascaris Kalyankar, 1971
Aliella Ali, 1968
Alifilaria Ali, 1969
Aliichnum Yang, 1983
Alinema Jogis, 1968
Allentylenchus Ahmed Khan & Saeed, 1988
Allintoshius Chitwood, 1937
Allomermis Steiner, 1924
Alocostoma Mawson, 1979
Alpenachitina Dunn & Miller, 1964
Alphacyathidae
Alphaichnus Cook & Bann, 2000
Altaevia Sarwar, 1957
Altaicornidae
Altaicyathidae
Altaicyathus Vologdin, 1932
Altherrnema Brzeski, 1961
Altichnus Bromley & Hanken, 1991
Alveolaimus Alekseev & Rassadnikova, 1977
Alyncoides Wieser, 1954
Amanitichnus Chlupac & Mikulas, 1995
Amazonema Siddiqi, 1983
Ambistapis Kruse, 1982
Amblydorylaimus Andrassy, 1998
Amblyonema Linstow, 1898
Ameeria Ali, 1961
Amerancylostoma Biocca & Le Roux, 1958
Amira Lane, 1914
Amiroides Strand, 1929
Amjohrea Maithy, 1992
Amoebinella He & Xie, 1989
Ampelichnus Hitchcock, 1865
Amphibiogoezia Ratnamala Rao, 1980
Amphibiophilus Skrjabin, 1922
Amphicaecum Walton, 1927
Amphicephaloides Beveridge, 1979
Amphidirhabditis Andrassy, 1978
Amphisakis Chakravarty & Majumdar, 1960
Amphisbaenema Orton Williams, 1982
Amphistenus Marion, 1870
Amphitylencholaimus Jairajpuri & Ahmad, 1992
Amphorachitina Poumot, 1968
Amplichitina Winchester-Seeto, 1996
Ampullachitina Collinson & Schwalb, 1955
Amularia Brera, 1811
Amydaicornidae
Anabaritellus Missarzhevsky, 1974
Anabaritidae
Anabylia Vodanjuk, 1989
Anacanthocheilus Wuelker, 1929
Ananconus Railliet & Henry, 1916
Ananus Rubtsov, 1978
Anaphelenchus Anderson & Hooper, 1980
Anaptyctocyathidae
Anaptyctocyathus Debrenne, 1969
Anaspicularis Akhtar, 1955
Anchidiplogaster Paramov, 1952
Anchidiplogasteroides Paramonov & Turlingina, 1955
Anchilocephali Brera, 1810
Ancientia Ross, 1967
Ancientidae
Ancistronema Smales, 1992
Anconichnus Kern, 1978
Ancryacanthus Linstow, 1876
Ancryocanthus Clerc, 1903
Ancyracantus Clerc, 1903
Ancyrochitina Eisenack, 1955
Andalusicyathus Perejon, 1976
Andersonfilaria Bartlett & Bain, 1987
Andersonstrongylus Webster, 1978
Andiva Fedonkin, 2002
Anenteronema Oshmarin, 1949
Anfesta Fedonkin, 1984
Anfractuosocoprolithus Bischoff, 1994
Angaricyathus
Angiocaulus Schultz, 1951
Angochitina Eisenack, 1931
Angra Travassos, 1929
Angranema Travassos, 1949
Anguillina Hammerschmidt, 1839
Angulichnus Elliott & Martin, 1987
Angulocirrus Biocca & Le Roux, 1957
Angustiochrea Valkov & Sysoev, 1970
Anisocellula Senowbari-Daryan, Zuhlke, Bechstadt & Flugel, 1993
Annelida
Annelidichnium Kuhn, 1937
Annerepichnites Kulkarni & Ghare, 1991
Annetuba Badve & Hare, 1980
Anningichnus Luo & Hu, 1999
Annulatusichnus Hu & Meng, 1991
Annulocyathella
Annulocyathidae
Annulocyathus Vologdin, 1940
Annulofilaria Hsu (Syui Ghui-nan), 1957
Annulofungia Krasnopeeva, 1955
Annulospira Jairajpuri & Siddiqi, 1969
Annulotunnelichnus Ghare & Kulkarni, 1986
Anomala Travassos, 1918
Anoplosomatum Grube, 1840
Anoplostrongylus Boulenger, 1926
Antarcticocyathus Debrenne, Rozanov & Webers, 1984
Antechiniella Quentin & Beveridge, 1986
Antechinostrongylus Spratt, 1981
Antedia Rafinesque, 1814
Antennocara Wassilkowa, 1926
Anterosculum Duan & Cao, 1989
Anthochitina Eisenack, 1971
Anthomorpha Bornemann, 1884
Anthomorphidae
Anthostrongylus Croveri, 1929
Anthotrum Luo & Hu, 1999
Anthracerpes Meek & Worthen, 1865
Anthuris Rudolphi, 1819
Antlerpeton Thomson, Shubin & Poole, 1998
Antoniocoscinus Debrenne, Zhuravlev & Rozanov, 1988
Antronoides Waggoner & Poteet, 1996
Anuronema Clark, 1978
Aormus Carus & Gerstaecker, 1863
Aorurus Leidy, 1849
Aphanimermis Rubzow, 1981
Aphanitylenchus Rubtsov, 1981
Aphidulum
Apistoconcha Conway Morris, 1990
Aplecta Railliet & Henry, 1916
Aplocerus Rafinesque, 1815
Apocyathus Vologdin, 1964
Apodichnites Hitchcock, 1869
Apodorylaimus Andrassy, 1988
Apoleptonchus Siddiqi, 1981
Aporcedorus Jairajpuri & Ahmad, 1983
Aporosocyathus Kruse, 1978
Apoxypus Sarjeant & Langston, 1994
Aproctiana Skrjabin, 1934
Aproctoides Chandler, 1929
Aptocyathella Konyushkov, 1964
Aptocyathus Vologdin, 1945
Aquaemermis Rubtsov, 1973
Arabanema Turpeenniemi, Nasira & Maqbool, 2001
Arborichnus Romano & Melendez, 1985
Arcantipsocidae Azar, Nel & Néraudeau, 2009
Archaeaspinus Ivantsov, 2007
Archaeatropidae
Archaeobullathus Yankauskas, 1965
Archaeobullatus Yankauskas, 1965
Archaeochitinia Eisenack, 1954
Archaeocyathidae
Archaeofungiella Zhuravleva, 1976
Archaeolynthus Taylor, 1910
Archaeooides Qian Yi, 1977
Archaeopetasus Conway Morris & Bengtson, 1990
Archaeopharetra Bedford & Bedford, 1936
Archaeopharetridae
Archaeophyllum Vologdin, 1931
Archaeornithipus Fuentes Vidarte, 1996
Archaeosyconidae
Archangelia Fedonkin, 1979
Archeobulura Quentin, 1970
Archeoentomichnus Hasiotis & Dubiel, 1995
Archicladium Qian & Xiao, 1985
Archionchus Cobb, 1913
Archithelandros Petter, 1966
Arcichnus Sutcliffe, 1997
Arcidorylaimoides Jairajpuri & Ahmad, 1992
Arctidorylaimus Mulvey & Anderson, 1979
Arctiplectus Andrassy, 2003
Arcuatichnus Kowalski, 1978
Ardrossacyathus Bedford, 1937
Arduena Mote, 1914
Arduenna Railliet & Henry, 1912
Arenigiapalla Bischoff, 1994
Arenituba Stanley & Pickerill, 1995
Argonevis Kozur & Mostler, 1972
Arisacyathus Kashina, 1979
Armigutta Schallreuter, 1981
Arminocyathus Vologdin, 1977
Armoricochitina Paris, 1981
Arnfieldia Sarwar, 1957
Aroonacyathus Gravestock, 1984
Aroonia Bengtson, 1990
Arouxina Munnecke, Servais & Vachard, 2000
Arrythmocricus Debrenne & James, 1981
Arteriofilaria López Caballero & Jiminez Millan, 1979
Arthrichnus Biron & Dutuit, 1982
Arthrocephaloides Yamaguti, 1961
Arthrocephalus Ortlepp, 1925
Arthrocyathus Vologdin, 1977
Arthrogyrinus Wilson & Almond, 2001
Arthrophycus Hall, 1852
Arthropoda
Arthropodichnus Gevers, 1971
Arthrostoma Cameron, 1927
Arthrotelsonichnus Chiplonkar & Ghare, 1975
Arthrurus Rafinesque, 1814
Artichnus Zakharov, 1972
Artigasia Christie, 1934
Arturocyathus Rozanov, 1973
Arundelia Mawson, 1977
Aruntacyathus Kruse & West, 1980
Ascaroides Barthélemy, 1858
Ascaroterakis Vicente, 1965
Ascochitina Tsegelnyuk, 1982
Ascocyathus Vologdin, 1960
Ascosoma Leuckart, 1828
Ascosomum Diesing, 1851
Asifia Lane, 1914
Asperotobrilus Shoshin, 1991
Asphaltinoides Devera, 1987
Aspiculus Ali, 1960
Aspidocephalus Diesing, 1851
Asterichnus Bandel, 1967
Asterocyathidae
Asterocyathus Vologdin, 1940
Asterotumulus Kashina, 1964
Asthenopodichnium Thenius, 1979
Astropolichnus Crimes & Anderson, 1985
Asturichnus Garcia-Ramos, 1977
Asymmetracantha Mawson, 1960
Asymmetricostrongylus Nagaty, 1932
Asymmetricus Kreis, 1930
Atalotaenia Garcia-Bellido Capdevila & Conway Morris, 1999
Ataxiocyathus Debrenne, 1974
Athernema Ahmad & Jairajpuri, 1978
Atlantaia Borrello, 1967
Atlantedorus Siddiqi, 1973
Auchenacantha Baylis, 1929
Auliscocyathidae
Auliscocyathus Debrenne, 1974
Aulocricus Debrenne, 1987
Aulomicritina Nagy, 1989
Aulonocephalus Chandler, 1935
Aulorhipis Ehlers, 1871
Aurisella Qian & Xiao, 1985
Austracerca Inglis, 1968
Australohalkieria Porter, 2004
Australonema Tshesunov & Spiridonov, 1985
Austraplectana Baker, 1981
Austrialaimus Gerber, 1981
Austrofilaria Johnston & Mawson, 1940
Austroheligmonema Mawson, 1961
Austroscolex Müller & Hinz-Schallreuter, 1993
Austroxyuris Johnston & Mawson, 1938
Autocryptomene Gemmellaro, 1846
Autoplectus Balsamo-Crivelli, 1843
Avellaria Freitas & Lent, 1934
Aviabronema Ali, 1961
Aviculariella Wehr, 1931
Avifilaria López Caballero & Jiminez Millan, 1979
Avifilaris Chapman Saunders, 1955
Avilandras Skrjabin & Shikhobalova, 1951
Avolatichnium Walter, 1983
Awbariichnium Novak, 1990
Axiciapes Sarjeant & Langston, 1994
Axiculifungia Debrenne & Debrenne, 1976
Axonchoides Thorne, 1967
Ayalaites Noda & Miranda, 1974
Azyricyathus Vologdin, 1964
Bactiria Fischer, 1808
Bacudacnitis Ferraz & Thatcher, 1988
Baetes Say, 1824
Baihupoichnus Wang, 2004
Baikalocyathus Yazmir, 1975
Baikalomermis Rubtzov, 1976
Baikalopectinus Gravestock, 1984
Baikonuria Koneva & Rozov, 1984
Bainechina Smales, 1999
Bairdascaris Sprent, 1982
Bakeria Moravec & Sey, 1986
Balanoglossites Mägdefrau, 1932
Balticapunctum Rozhnov, 1989
Baltochitina Paris & Grahn, 1999
Bancroftinema Johnston & Mawson, 1941
Banffidae
Baronichnus Breton, 2002
Barrosopus Coria, Currie, Eberth & Garrido, 2002
Barusispirura Chabaud, 1975
Basiliophora Husain & Khan, 1965
Basiphinema Conn & Sher, 1972
Basirella Biswas & Chakravarty, 1963
Basiriella Ahmed & Jabin, 1966
Basirienchus Geraert & Raski, 1985
Basirolaimus Shamsi, 1979
Batenevia Krasnopeeva, 1961
Bathmostomum Railliet & Henry, 1909
Bathymermis Daday, 1911
Batrachocamallanus Jackson & Tinsley, 1995
Batracholandros Freitas & Ibáñez, 1965
Batrachonema Yuen, 1965
Batrachostrongylus Yuen, 1963
Batschykicyathus Zhuravlev, 1983
Bayleicyathus Gravestock, 1984
Baylisnumidica López-Neyra, 1945
Bcharreglaris Azar & Nel, 2004
Beaconichnus Gevers, 1973
Beaconites Vialov, 1962
Beddingia Blinova & Korentchenko, 1986
Befilaria Chabaud, Petter & Golvan, 1961
Beidazoonidae
Belanisakis Maplestone, 1932
Belichnus Pether, 1995
Bellaplectana Skrjabin, Schikhobalova & Lagodovskaya, 1961
Belocosmorhaphe Uchman, 1998
Belondirium Andrassy, 1976
Belondorylaimellus Jairajpuri & Ahmad, 1980
Belonechitina
Beltanacyathidae
Beltanacyathus Bedford & Bedford, 1936
Bengtsonia Missarzhevskiy & Grigoryeva, 1981
Bercutia Missarzhevskij, 1981
Bergheia Drozdz, 1965
Berntsenus Massey, 1974
Bessonoviella Bessonov, 1996
Beveridgea Mawson, 1980
Beveridgiella Humphery-Smith, 1981
Bhalfilaria Bhalerao & Krishna Rao, 1944
Bhanrerichnus Mathur & Verma, 1983
Bialata Morishita, 1926
Bicavichnites Lane, Braddy, Briggs & Elliott, 2003
Bichordites Plaziat & Mahmoudi, 1988
Biconcavichnus Wang & Wang Ning, 1995
Biconigutta Schallreuter, 1981
Biconulites Teilhard de Chardin, 1931
Bicoscinus Debrenne, 1977
Bicyathus Vologdin, 1939
Bifasciculus Volk, 1960
Biformites Linck, 1949
Bifurcatichnus Holub & Kozur, 1983
Bigalkea Mönnig, 1931
Bigalkenema Ortlepp, 1963
Biguetius Chabaud, Petter & Golvan, 1961
Bilinichnus Fedonkin & Palij, 1979
Binatocyathus Vologdin, 1963
Bioccastrongylus Chabaud, Petter & Brygoo, 1961
Biogastranema Rohrbacher & Ehrenford, 1954
Bipallicyathidae
Bipallicyathus Zhuravlev, 1982
Bipatinella Zheng, 1994
Bipesia Matthew, 1909
Bipezia Matthew, 1909
Bipidites Rafinesque, 1831
Bipodomorpha Yang, 1984
Biramous Yang, 1992
Biscopulatichnus Li, 1993
Bisulcus Hitchcock, 1865
Bitubichnites Kulkarni & Ghare, 1989
Bla Inglis, 1963
Blaberinema Garcia & Coy, 1998
Blastasteria Debrenne, Termier & Termier, 1973
Blatellicoloides Farooqi, 1967
Blattelicola Basir, 1940
Blephastoma Rafinesque, 1815
Boehmiella Gebauer, 1932
Bogdanowia Zograf, 1913
Bogschites Kozur & Mostler, 1972
Boleodoroides Mathur, Khan & Prasad, 1966
Bomakellidae
Bombycion Porter, Meisterfeld & Knoll, 2003
Bonariensia Borrello, 1967
Bonniea Porter, Meisterfeld & Knoll, 2003
Boraceianema Travassos & Kloss, 1958
Borania Ricci, 1939
Borocyathus Voronin, 1988
Borrellostrongylus Gutiérrez, 1945
Bosceculcyathus Krasnopeeva, 1965
Bosicola Sandground, 1929
Bostrichodera Sandground, 1938
Botalium Heyns, 1963
Botocyathus
Botomocyathidae
Botomocyathus
Bottonaecyathus Radionova, 1967
Bourgelatia Railliet, Henry & Bauche, 1919
Bourgelatioides Chandler, 1931
Bouturrilepas Hoare, 2002
Boveelaimus Alekseev & Rassadnikova, 1977
Bovicornellum Howell, 1934
Bowengriphus Ritchie & Edgecombe, 2001
Boyarinovicyathus Zhuravleva, 1997
Boydinema Barus & Tenora, 1972
Brachiopoda Duméril, 1806
Brachyclonus Railliet & Henry, 1910
Brachydesmodora Allgén, 1932
Brachynema Cobb, 1893
Brachynemella Cobb, 1933
Bractocyathus Kruse, 1978
Bradylaimoides Timm, 1961
Bradylaimus Stekhoven, 1931
Bradypostrongylus Price, 1928
Bradystoma Stekhoven, 1943
Brakichnium Novak, 1990
Branchiarius Montagu, 1815
Branchiarus Oken, 1817
Brasilnema Moravec, Kohn & Fernandes, 1992
Brdichnus Mikulas, 1991
Breinlia Yorke & Maplestone, 1926
Brevicephalodera Kaushal & Swarup, 1988
Brevigraphidium Freitas & Mendonça, 1960
Brevimermis Rubtsov, 1974
Brevispiculoides Ortlepp, 1939
Brevistoma Mukhina, 1981
Brevistriata Travassos, 1937
Brevithominx Travassos, Teixeira de Freitas & Machado de Mendonça, 1964
Brijicola Pande, 1960
Bronchocyathidae
Bronchonema Mönnig, 1932
Bronchostrongylus Cameron, 1931
Brookvalichnus Webby, 1970
Brownichnus Genise, 2000
Brueckneria Boll, 1846
Brugiella Dissanaike & Paramananthan, 1961
Brumptaemilius Dollfus, 1952
Brushenodus Jiang, 1982
Brygoofilaria Sulahian & Schacher, 1968
Brygoonema Durette-Desset & Chabaud, 1981
Bryozoa
Buccostrongylus Johnston & Mawson, 1939
Bucerusichnus Zhang Luyi, 1986
Buchholzbrunnichnus Germs, 1973
Buckleya Sarwar, 1956
Buckleyatractis Khalil & Gibbons, 1988
Buckleyella Rasheed, 1963
Buckleyenterobius Sandosham, 1950
Buckleyfilaria Singh, 1949
Buckleynema Ali & Singh, 1954
Buckleyuris Sarwar, 1959
Buffonia Rafinesque, 1814
Bufonerakis Baker, 1980
Buissonia Neveu-Lemaire, 1924
Bulbochitina Paris, 1981
Bulhoesia Schwenck, 1926
Bullaenema Sauer, 1967
Bullicyathus Vologdin, 1977
Bunomystrongylus Hasegawa & Mangali, 1996
Burangichnus Song, 1987
Burmanema Timm, 1967
Burrinjuckia Chatterton, 1975
Bursachitina Taugourdeau, 1966
Buschmannia Kaever & Richter, 1976
Bustomum Lane, 1917
Butakovicyathus Zhuravleva, 1980
Butleriellus Meyl, 1960
Butovia Vologdin, 1931
Butunia Keller, Dolnik & Velkov, 1982
Buzionema Kloss, 1966
Byronia Matthew, 1899
Caballeroides Chaturvedi & Khera, 1977
Caballeroispirura Barus, 1963
Caballeronema Margolis, 1977
Caballonema Abuladze, 1937
Caconema Cobb, 1924
Cadniacyathus Bedford, 1937
Caenostrongylus Lent & Freitas, 1938
Cagourakis Petter, Chermette & Vassart, 1989
Calathites Luo & Hu, 1999
Calixichnium Plicka, 1981
Calpichitina Wilson & Hedlund, 1964
Calpichtina
Calvatylus Jairajpuri & Siddiqi, 1977
Calycichitina Tsegelnyuk, 1982
Calypsostrongylus Schmidt, 1967
Calyptocoscinidae
Calyptocoscinus Debrenne, 1964
Camallanides Baylis & Daubney, 1922
Camborygma Hasiotis & Mitchell, 1993
Cambrobotris Missarjevsky, 1989
Cambrocassis Missarzhevsky, 1977
Cambrocyathells
Cambrocyathellus Zhuravleva, 1960
Cambrogeorgina Müller & Hinz, 1992
Cambronanus Fonin, 1963
Cambronatus Briggs & Bartles, 2001
Cambrorhytium Conway Morris & Robison, 1988
Cambrorygma Hasiotis & Mitchell, 1993
Cambrotentacus Zhang & Shu, 2001
Cambrotubulus Missarzhevskii, 1969
Camenella Missarzhevsky, 1966
Cameronecator Lichtenfels, 1980
Camerostrongylus Wolfgang, 1950
Camerotheca Matthew, 1885
Campanarougetia Le-Van-Hoa & Pham-Ngoc-Khue, 1967
Campbellenehus Wouts, 1978
Camponotimermis Ipat'eva, Pimenova & Muchamedzjanova, 1980
Campthelmis Gistl, 1857
Canalispalliatum Blau, Grun & Jagt, 1997
Capillaroides Moravec, 1987
Capillicyathidae
Capillicyathus Vologdin, 1964
Capitellus Siddiqi, 1983
Capreocauius Schulz & Kadonatsii, 1948
Caprionchulus Swart & Heyns, 1993
Caprionichnus Harland, 1978
Capsolynthus Osadchaya, 1967
Capsularia Zeder, 1800
Capsulocyathus
Captivonema Bostrom, 1994
Caputia Granzow, 1989
Caputonchus Siddiqi, 1984
Caraburina Kraskov, 1985
Carbonochitina Tasch & Hutter, 1978
Cardianema Alicata, 1933
Cardiodictyon Hou, Ramskold & Bergstrom, 1991
Cardioichnus Smith & Crimes, 1983
Cardionema Yamaguti, 1941
Cardiophyllum
Cardiostrongylus Sakamoto & Malgor, 1995
Carinacyathidae
Carinacyathus Vologdin, 1932
Carinema Pereira & Vaz, 1933
Carinoscapter Siddiqi, 1998
Carlosia Travassos & Kloss, 1957
Carmelopodus Lockley, Hunt, Paquette, Bilbey & Hamblin, 1998
Carnivoricoprus Vyalov, 1976
Carnotipus Lopez, Mayoral, Munoz, Perez & Santamaria, 1992
Carnoya Gilson, 1898
Carnoychaeta Garcia, Coy & Alvarez, 1995
Carolodelatorrella Vigueras, 1943
Carostrongylus Durette-Desset & Vaucher, 1989
Carpatia Plicka, 1986
Carpatochitinoides Planderova, 1975
Carpicyathus
Carubacgutes
Casplrillina Bykova, 1971
Cassunema Beveridge & Johnson, 1981
Castorstrongylus Chapin, 1925
Castronodus Singh, 1934
Catellichnus Bekker, 1989
Catellocaula Palmer & Wilson, 1988
Catenarichnus Bradshaw, 2002
Catenichnus McCarthy, 1979
Cattiena Hunt & Spiridonov, 2001
Caturates Forster, 1827
Caudichnus D'Alessandro & Iannone, 1993
Caudpilla Sudhaus, 1986
Caugichnus Hofmann, 1979
Cavaulichnus Jiang, 1982
Caveacus Landing, 1995
Caveasphaera Xiao & Knoll, 2000
Cavernula Radtke, 1991
Cavilaimus Wieser, 1951
Cavioxyura Quentin, 1975
Cavocyathus Fonin, 1966
Cellicalichnus Genise, 2000
Cellicyathus Debrenne & Zhuravlev, 1990
Centrichnus Bromley & Martinell, 1991
Cepanowakia Alberti, 1987
Cephachisma Rafinesque, 1832
Cephalacanthus Diesing, 1853
Cephalipus Rafinesque, 1815
Cephalodorylaimus Jairajpuri, 1967
Cephaloleichnites Wilf, Labandeira, Kress, Staines, Windsor, Allen & Johnson, 2000
Cephalostrongylus Irwin-Smith, 1921
Cepinula Schafhäutl, 1851
Ceramotylenchus Ebsary, 1986
Cerascaris Cobb, 1927
Ceratochitina Tsegelnyuk, 1982
Ceratomorpha Yang & Sun, 1982
Ceratosphaerolaimus Fadeeva, 1983
Ceratospira Schneider, 1866
Ceratotheca Novak, 1891
Cerchnotocriconema Bernard, 1982
Cercofilaria Kalantarian, 1924
Cercogylus Petter & Brochier, 1989
Cerebrofilaria Kazubski, 1958
Ceretospira Lintow, 1883
Cervicaprastrongylus Gibbons & Khalil, 1982
Cervonemella Beveridge, 2001
Cestocephalus Rasheed, 1966
Ceylancylostoma Lane, 1916
Chabakovicyathidae
Chabakovicyathus Konyushkov, 1964
Chabaudechina Smales, 1999
Chabaudiella Diaz-Ungria, 1964
Chabaudinema Diaz-Ungria, 1968
Chabaudstrongylus Durette-Desset & Denke, 1978
Chabaudus Inglis & Ogden, 1965
Chabertiella Tadros, 1964
Chabfilaria Bain, Dedet & Purnomo, 1983
Chaetognatha
Chagrinichnites Feldmann, Osgood, Szmuc & Meinke, 1978
Chakassicyathus Zhuravleva & Osadchaja, 1974
Chalasiocranos Brock & Cooper, 1993
Chancelloriella Demidenko, 2000
Chancelloriidae Walcott, 1920
Chandleronema Little & Ali, 1980
Changicyathus Debrenne & Zhuravlev, 1990
Changtuella Liu & Gao, 1992
Chankacyathus
Chankcyathidae
Chaolaimus Cobb, 1893
Chapadmalidium Borrello, 1967
Chapiniella Yamaguti, 1961
Characichnos Whyte & Romano, 2001
Characostomum Railliet, 1902
Charaeostomum Linstow, 1906
Charniidae
Cheiichnus Jensen & Bergstrom, 2000
Cheilonematodum Johnston & Mawson, 1941
Cheilospirura Diesing, 1861
Cheiracanthus Diesing, 1839
Cheiranthus Linstow, 1893
Cheiriacanthus Schneidemuehl, 1896
Cheiropteronema Sandground, 1929
Cheirospirura Drasche, 1884
Chelipus Sarjeant & Langston, 1994
Chelonidracunculus Yamaguti, 1961
Cheloniheterakis Yamaguti, 1961
Chengdeina Liu, 1990
Chengkoucyathus Yuan, 1974
Cheniellospirura Kuo, 1961
Chenofilaria Kou, 1958
Chenospirura Kou, 1958
Cherylia Bain, Petit, Jacquet-Viallet & Houin, 1985
Chevronichnus Hakes, 1976
Chiercanthus Mitter, 1910
Chilocrypta Mönnig, 1932
Chimerolites Marek, 1967
Chiracanthus Creplin, 1841
Chiropterofilaria Yeh, Symes & Mataika, 1958
Chiroptestrongylus Skarbilovitsch, 1930
Chiroptostrongylus Skarbilovitch, 1933
Chitinoaphelenchus Micoletzky, 1922
Chitwoodchabaudia Puylaert, 1970
Chitwoodiella Basir, 1948
Chitwoodielloides Ahmad & Araki, 2003
Chitwoodspirura Chabaud & Rousselot, 1956
Chlamydoprocta Chandler, 1954
Cholerophytum Debey, 1867
Chomatichnus Donaldson & Simpson, 1962
Chondrites Sternberg, 1833
Chondritis Göppert, 1847
Chondritoides Borrello, 1966
Chondrorhaphe Seilacher, 1977
Chordata
Chordatortilis Mendonça & Rodrigues, 1965
Chordocephalurus Alegret, 1941
Chordoichnus Mathur, 1983
Choriorhabditis Osche, 1952
Chouberticyathus Debrenne, 1964
Christaceps Mawson, 1971
Christiella Travassos & Kloss, 1957
Chromanema Khera, 1975
Chromarina Kreis, 1929
Chromonema Khan, Brooks & Hirschmann, 1976
Chroniodiplogaster Poinar, 1990
Chrysodorus Jiménez-Guirado & Cadenas, 1985
Chrysomelimermis Rubtsov & Salmanov, 1980
Chuchliona Snajdar, 1983
Churanocyathus Sundukov, 1984
Chuxiongpus Chen & Huang, 1993
Cicatricula Palmer & Palmer, 1977
Cilindromaculum Gutierrez Marco, 1984
Cingulochitina Paris, 1981
Cinmicritina Nagy, 1989
Ciorhynchus Zeder, 1803
Circolites Mikulas, 1992
Cissophyllus Railliet & Henry, 1912
Citellinema Hall, 1916
Citellinoides Dikmans, 1939
Cithariniella Khalil, 1964
Cladichnus d'Alessandro & Bromley, 1987
Cladocephalus Swart & Heyns, 1991
Cladochitina
Claruscocoscinidae
Claruscoscinus
Clathricoscinidae
Clathricoscinus
Clathricyathellus Borodina, 1974
Clathricyathus Vologdin, 1932
Clathrithalamus Debrenne & Kruse, 1986
Clathrochitina Eisenack, 1959
Clathrochitinella Cramer, 1967
Clavachitina Taugourdeau, 1966
Clavatulicola Radwanski & Baluk, 1997
Clavaurotylenchus Caveness, 1958
Clavicyathus Vologdin, 1977
Clavidorylaimellus Jairajpuri & Ahmad, 1980
Clavigula Siddiqi, 1995
Clavilenchus Jairajpuri, 1966
Clementeia Artigas, 1930
Climacodichnus Hitchcock, 1865
Cloeoascaris Baylis, 1923
Cloudinidae Hahn & Pflug, 1985
Cnidaria Hatschek, 1888
Cnidophora Wang, Qiang & Fan, 1994
Cnizostrongylus Chabaud, Durette-Desset & Houin, 1967
Cobalia Etallon, 1859
Cobboldia Leiper, 1910
Cobboldina Leiper, 1911
Cobboldostrongylus Sarwar, 1956
Cochlichnus Hitchcock, 1858
Coenobichnus Walker, Holland & Gardiner, 2003
Colchus Lamouroux, 1823
Coleolidae Fischer, 1962
Collarinema Sey, 1970
Colobenterobius Quentin, Bellerton & Krishnasamy, 1980
Colobostrongylus Sandground, 1929
Cololithes
Columbostrongylus Puyleart, 1968
Cometa Tilesius, 1805
Cometeterakis Crusz & Ching, 1976
Communichnus Snedden, 1991
Compaginatichnus Pickerill, 1989
Complicatocyathus Yarosheviech, 1990
Compomicritina Nagy, 1989
Compositocyathus Zhuravleva, 1960
Conannulofungia Yuan, 1980
Conchotrema Teichert, 1945
Congerimicritina Nagy, 1989
Conicula Luo & Hu, 1999
Conigalea Ivanov, 1995
Conispiculum Pandit, Pandit & Iyer, 1929
Conocephalus Diesing, 1861
Conochitina Eisenack, 1931
Conoidocyathidae
Conoidocyathus Vologdin, 1964
Conoweberia Ihle, 1922
Contortospiculum Skriabin, 1916
Cooperioides Daubney, 1933
Copemania Durette-Desset & Beveridge, 1981
Copleicyathus Bedford, 1937
Coprotylenchus Akopova, 1997
Cordicauda Durette-Desset, 1971
Cordilleracyathus
Cordobicyathus
Cordonema Schmidt & Kuntz, 1972
Cordonicola Ali & Farooqui, 1969
Cordophilus Monnig, 1926
Corimbatichnus Genise & Verde, 2000
Cornilaimus Truskova & Eroshenko, 1977
Cornulatichnus Carroll & Trewin, 1995
Cornutocyathus Boyarinov, 1997
Cornuvacites Kozur & Mostler, 1972
Corocolla Sheppard, 1829
Corollonema Beveridge & Chilton, 1998
Corollostrongylus Beveridge, 1978
Coronacephalus Ganguly & Khan, 1987
Coronatylencholaimellus Jairajpuri & Ahmad, 1992
Coronatyleptus Siddiqi, 1982
Coronilla Beneden, 1871
Coronochitina
Coronofilaria Yorke & Maplestone, 1926
Coronostoma Rao, 1958
Coronostronglyus Johnston & Mawson, 1939
Corophioides Smith of Kilwinning, 1893
Corpicyathus Osadchaya, 1967
Correptomicritina Nagy, 1989
Corticicyathus Vologdin, 1977
Corydiella Rao & Rao, 1965
Corymbipes Sarjeant & Langston, 1994
Cosalaimus Siddiqi, 1993
Coscinocyathella
Coscinocyathellidae
Coscinocyathellus
Coscinocyathidae
Coscinoptyctidae
Coscinoteichus Debrenne, 1964
Cosmocercella Steiner, 1924
Cosmocyathus Yazmir, 1975
Cosmostrongylus Spratt, 1984
Cosmoxynemoides Travassos, 1949
Cosmoynema Travassos, 1949
Costanemella Andrassy, 2001
Costarcuata Shultz & Kadenatzi, 1950
Costocyathus Fonin, 1985
Cothonolaimus Ditlevsen, 1919
Cotylascaris Sprent, 1971
Cotyledion Luo & Hu, 1999
Cotylocillus Duan & Cao, 1989
Courduriella Chabaud, Brygoo & Petter, 1961
Coylipus Rafinesque, 1815
Coyptoporocyathus
Crassibucca Mulvey & Jensen, 1967
Crassicoscinidae
Crassicoscinus Rozanov & Zhuravlev, 1988
Crassicyathus Vologdin, 1977
Crassisoma Alessandrini, 1909
Crassogula Andrassy, 1991
Crateronema Siddiqi, 1969
Cremnodinotus Liu, 1987
Crenatobronema Solovjeva, 1987
Cribricyathidae
Cribricyathus Vologdin, 1964
Cribronema Siddiqi, 1993
Cribroscyphia de Fromentel, 1860
Cricetoxyuris Hugot, 1988
Cricodorylaimus Ahmad & Sturhan, 2001
Crino Lamarck, 1798
Crinola Rafinesque, 1815
Crinon Chabert, 1782
Crinophagus Arendt, 1985
Crinops Gervais, 1844
Crispus Yankauskas, 1965
Cristaceps Mawson, 1971
Cristamphidelus Siddiqi & Vinciguerra, 1991
Cristatheca Sysoev, 1970
Cristatodus Gridina, 1991
Crocodylocapillaria Moravec & Spratt, 1998
Croserinema Khan, Chawla & Saha, 1976
Crossocephalus Railliet, 1909
Crossonemoides Eroshenko, 1981
Crucicyathus Gravestock, 1984
Cruorifilaria Eberhard, Morales & Orihel, 1976
Crusmicritina Nagy, 1989
Crycophorus Chaves, 1930
Cryptaphelenchoides Goodey, 1960
Cryptaphelenchus Fuchs, 1937
Cryptonchulus Sukul, 1969
Cryptoporocyathus Zhuravleva, 1960
Ctenichnites Selwyn, 1890
Ctenocephalus Linstow, 1904
Ctenodactylina Bernard, 1969
Ctenophora Eschscholtz, 1829
Cuculanus Bloch, 1782
Cucullus Steiner, 1994
Cumulusichnium Plicka, 1983
Cunctichnus Fürsich, Palmer & Goodyear, 1994
Cunicularius Hitchcock, 1858
Cupithecidae Xing et al., 1984
Curvichnus Nielsen, 2002
Curviconophorus Rudkin, 1998
Curvidorylaimus Jairajpuri & Rahman, 1982
Curvitubus Duan & Cao, 1989
Cutichitina Achab, Asselin & Soufiane, 1993
Cyathochitina Eisenack, 1955
Cyathocricus Debrenne, 1969
Cyathostomidae
Cycliocyrillium Porter, Meisterfeld & Knoll, 2003
Cycliophora Funch & Kristensen, 1995
Cyclobulura Quentin, 1977
Cycloclinum Ryckholt, 1862
Cyclocyathella
Cyclogeorgina Müller & Hinz, 1992
Cyclopsinema Cobb, 1927
Cyclopuncta
Cyclostrongylus Johnston & Mawson, 1939
Cyclozone Dogiel, 1932
Cyclozoon Wurm, 1911
Cylichnostomum Looss, 1901
Cylicobrachytus Cram, 1924
Cylicocercus Ihle, 1922
Cylicostoma Looss, 1911
Cylicostomias Cram, 1925
Cylicostomum Railliet, 1901
Cylicostrongylus Yamaguti, 1961
Cylicotoichus Cram, 1924
Cylindricavus Borkar & Kulkarni, 1987
Cylindrichnus Toots, 1962
Cylindricotheca Liu, 1990
Cylindricum Linck, 1949
Cylindridera Dougherty, 1953
Cylindrocavites Ghare, 1982
Cylindrochites Liu, 1990
Cylindrochitina Schallreuter, 1963
Cylindrocraterion Ghare & Badve, 1977
Cylindropharynx Leiper, 1911
Cylintrotylenchus Yang Baojun, 1985
Cymaderma Duns, 1877
Cymataulus Rindsberg, 1994
Cymbia Jiang, 1982
Cynipanguina Maggenti, Hart & Paxman, 1973
Cyphinites Duan, Cao & Zhang, 1993
Cyphomesus Rafinesque, 1814
Cyphonichnus Karaszewski, 1974
Cyrtochites Qian, 1984
Cystagora Stafford, 1905
Cystichnium Hu & Wu, 1993
Cystocephalus Railliet, 1895
Cystofilaria Skrjabin & Shikhobalova, 1948
Dabashanites Chen, 1979
Dachmius Baillet, 1862
Dachnitis Cobbold, 1858
Dacnites van Beneden, 1861
Dacnitis Dujardin, 1844
Dacnitoides Ward & Magath, 1917
Dactylotylenchus Wu, 1968
Dactyluraxonchium Coomans & Nair, 1975
Dadayia Micoletzky, 1922
Daenitis Linstow, 1900
Dartevellenia Ezzat, 1954
Dasychitina Tsegelnyuk, 1982
Dasypafilaria Eberhard, 1982
Dasypostrongylus Travassos, 1935
Daubneyia Leroux, 1940
Davidicyathus Debrenne & Zhuravlev, 1990
Davtianostrongylus Boev, 1950
Dazeodesma Borrello, 1967
Debrennecyathus Vologdin, 1966
Deceptioncyathus Gravestock, 1984
Decrusia Lane, 1914
Degeletticyathellus Zhuravleva, 1974
Degeletticyathus
Deiradoclavus Conway Morris & Chen Menge, 1991
Dekosichnus Genise & Hazeldine, 1995
Delamurella Gubanov, 1952
Deletrocephalus Diesing, 1851
Delicata Travassos, 1935
Deliria Vicente, Magalhäes Pinto & Noronha, 1980
Denaecyathellus Osadchaya, 1979
Denaecyathus Zhuravleva, 1967
Dendroidichnites Demathieu, Gand & Toutin-Morin, 1992
Dendrorete Tavernier, Campbell & Golubic, 1992
Dendrorhaphe Seilacher, 1977
Densichitina Paris, 1981
Densignathus Daeschler, 2000
Densocyathidae
Densocyathus Vologdin, 1945
Dentatocoscinus Zhuravlev, 1988
Dentatocyathus Okuneva, 1972
Denticamallanus Moravec & Thatcher, 1997
Denticulospirura Johnston & Mawson, 1941
Dentinella Lochman, 1966
Dentocamallanus Moravec & Scholz, 1991
Dentomermis Rubtsov & Polishchuk, 1975
Dentostomella Schulz & Krepkogorskaja, 1932
Deraiophoronema Romanovitch, 1916
Dermatopallarya Skrjabin, 1924
Dermofilaria Rivolta, 1884
Derris Adams, 1797
Derventia Lakova, 1997
Desertites Duan & Xiao, 1992
Desmichnus Hecker, 1980
Desmicola Basir, 1956
Desmochitina Eisenack, 1931
Desmognathinema Baker, Goater & Esch, 1987
Dessetfilaria Bartlett & Bain, 1987
Dessetostrongylus Humphery-Smith, 1981
Deuteronectanebos Schram, 1979
Devoniana Sergeeva, 1979
Devonoscalae Langer, 1979
Dexolites Hopkinson, 1870
Diadeloplax Hoare & Mapes, 1995
Diceloides Timm, 1967
Dicentrocephalus Diesing, 1861
Dicerocola Round, 1962
Diceronema Gibbons, Knapp & Krecek, 1996
Dicerotinichnus Guerin & Demathieu, 1993
Dichlostoma Rafinesque, 1814
Dickinsonia Sprigg, 1947
Dickinsoniidae
Diclidosiphon Diesing, 1851
Dictyocyathidae
Dictyofavus Gravestock, 1984
Dictyosycon Zhuravleva, 1962
Dicynodontocopros Hunt, Lucas & Lockley, 1998
Didactyluris Freitas & Dobbin, 1960
Didazoonidae
Didelphoxyuris Gardner & Hugot, 1995
Didelphyoptera Schulz, 1927
Didelphysoma Schulz, 1927
Didilia Tang, Hominick, Killick-Kendrick, Killick-Kendrick & Page, 1993
Didoryllium Izatullaeva, 1967
Didymaulichnus Young, 1972
Didymaulyponomos Bradshaw, 1981
Didymocyathus
Diffusasterella Demidenko, 2001
Digidorylaimoides Jairajpuri & Ahmad, 1992
Digitichnus Ekdale & Picard, 1985
Dimidia Jiang, 1982
Dimorphoconus Donovan & Paul, 1985
Dinocochlea Woodward, 1922
Dinomischidae
Dinomischus Conway-Morris, 1977
Dioctowittus Chabaud & Hoa, 1960
Diomedenema Johnston & Mawson, 1952
Diopsura Rafinesque, 1814
Diorygma Biernat, 1961
Dipatulichnus Nielsen & Nielsen, 2001
Diplepha Rafinesque, 1832
Diplocraterion Torell, 1869
Diplocyathellus Debrenne, 1977
Diplogasterium Paramonov, 1952
Diplolaimus Linstow, 1876
Diploodon Molin, 1861
Diplopodomorpha Chiplonkar & Badwe, 1970
Diplospinella Vassiljeva, 1988
Diplotheca Matthew, 1885
Diplotriaenoides Walton, 1927
Dipodichnites Hitchcock, 1844
Dipteromermis Rubtzov, 1976
Discaelia Fromentel, 1875
Discaxonchium Coomans & Nair, 1975
Dischonia Vosmaer, 1885
Discocapillaria De & Maity, 1996
Discochitina Tsegelnyuk, 1982
Discoides Luo & Hu, 1999
Discomermis Coman, 1971
Discophorus Mehlis, 1844
Discotomaculum Chiplonkar & Badve, 1972
Disctylencholaimus Jairajpuri & Ahmad, 1992
Diserratosomus Mirza, 1933
Disiphas Rafinesque, 1815
Disparagus Annett, Dutton & Elliott, 1901
Dispharagus Dujardin, 1844
Dispimermis Rubtsov, 1980
Distolabrellus Anderson, 1983
Disynema Rafinesque, 1832
Ditabulipora Sheng, 1991
Ditrachyceras Sulzer, 1809
Ditrachyceros Hermann, 1801
Ditrachycerosoma Brera, 1809
Ditremamermis Camino & Poinar, 1989
Diversiphinema Conn & Sher, 1972
Divisispiculimermis de Doucet, 1986
Divittus Jairajpuri, 1984
Diximermis Nickle, 1972
Dochmia Braddon, 1893
Dochmins Leuckart, 1865
Dochmius Dujardin, 1844
Dochmoides Cameron, 1924
Docmius Dujardin, 1845
Doemius Sonsino, 1878
Dogielina Sobolev, 1949
Dohmius Looss, 1902
Dokidocyathella Zhuravleva, 1962
Dokidocyathellidae
Dokidocyathidae
Dolichocyathus Vologdin, 1964
Dollfusstrongylus Quentin, 1970
Dominicactinolaimus Jairajpuri & Ahmad, 1992
Dongshania Hou & Bergstrom, 1998
Doohmius Molin, 1861
Dorcopsinema Mawson, 1977
Dorcopsistrongylus Smales, 1982
Dorsalla Jairajpuri, 1966
Dorygaster Khera, 1970
Dosmius Chalpowski, 1909
Dracaphididae Hong, Zhang, Guo & Heie, 2009
Draschearia Skrjabin, Sobolev & Ivaschkin, 1965
Drepanochites
Drilonema Pierantoni, 1916
Dromaeostrongylus Lubimow, 1933
Dubioxyuris Ortlepp, 1938
Dudekemnema Skryabin, Shikhobalova & Lagodovskaya, 1966
Dujardinia Gedoelst, 1916
Dukerostrongylus Dinnik & Boev, 1982
Duotylenchus Saha & Khan, 1982
Duovestigia Butts, 1891
Duplicaecum Majumdar & Chakravarty, 1963
Dupliporocyathus Yazmir, 1975
Durettechina Smales, 2000
Durettestrongylus Guerrero, 1983
Duriella Dhanam & Shamim Jairajpuri, 1999
Durikainema Spratt & Speare, 1982
Dyacanthos Stiebel, 1817
Dyacanthus Rudolphi, 1819
Dytrachyceros Bremser, 1819
Dzhagdycyathus Belyaeva, 1975
Earlachitina Collinson & Scott, 1958
Eatonichnus Bown, Hasiotis, Genise, Maldonado & Brouwers, 1997
Echinivesica Sheng, 1991
Echinocyathus Vologdin, 1960
Echinodermata Klein, 1734
Echinopharynx Thapar, 1925
Echinurioides Thwaite, 1926
Echiura Newby, 1940
Edaphichnium Bown & Kraus, 1983
Edesonfilaria Yeh, 1960
Egiinocyathus Fonin, 1983
Eichbaumia Schallreuter, 1981
Eisenachichnus Kozur, 1983
Eisenackisyrinx Mierzejewski, 1986
Eisenackitina
Ejectonites Kulkarni & Ghare, 1989
Elaphocephalus Molin, 1860
Elaphroma Rafinesque, 1815
Elasenia Fedonkin, 1983
Elatera Herman, 1985
Eldoniidae
Elingua Orlowski, 1989
Elisell Peel & Berg-Madsen, 1989
Elkanospina Missarjevsky, 1989
Elongidorylaimellus Jairajpuri & Ahmad, 1980
Elongiphinema Cohn & Sher, 1972
Embrionellina Bykova, 1971
Eminensia Mahajan, 1980
Encephalonema Parukhin & Oshmarin, 1960
Enchodorella Khan, 1964
Enchodorus Vinciguerra, 1976
Enchodrella Khan, 1964
Endaulites Marintsch & Finks, 1982
Endotamia Rafinesque, 1814
Enigmatichnus Crimes & Germs, 1982
Enigmatopus Biron & Dutuit, 1982
Enoplostoma Marion, 1870
Enormichnium Novak & Plicka, 1986
Ensitheca Duan, 1984
Enstrongylus Pease & Smith, 1905
Entradichnus Ekdale & Picard, 1985
Eoalvinellodes Little, Maslennikov, Morris & Gubanov, 1999
Eocavum Buchholz, 1986
Eocucumaria Qian & Ding, 1988
Eomermis Steiner, 1925
Eosolena Herman, 1985
Eozoon Dawson, 1865
Epaxonchium Coomans & Nair, 1975
Ephippiodera Schagalina & Krall, 1981
Epimenides Gutierrez, 1949
Epitheliomyces Rivolta, 1877
Epithonia Etallon, 1862
Equicoprus Vyalov, 1976
Erbocyathidae Volgdin & Zhuravleva, 1956
Eremitacyathidae
Eremitacyathus Zamarreno & Debrenne, 1977
Eremochitina Taugourdeau & Jekhowsky, 1960
Erinea Kozur & Mostler, 1972
Erismacoscinus Debrenne, 1958
Erniaster Pflug, 1972
Erniettidae
Erniobaris Pflug, 1972
Erniobeta Pflug, 1972
Erniocarpus Pflug, 1972
Erniocentris Pflug, 1972
Erniocoris Pflug, 1972
Erniodiscus Pflug, 1972
Erniofossa Pflug, 1972
Erniograndis Pflug, 1972
Ernionorma Pflug, 1972
Erniopelta Pflug, 1972
Erniotaxis Pflug, 1972
Erphyllum
Erschovicaecum Mozgovoi, 1951
Erugatocyathus Debrenne, 1969
Eschenbachiellus Briggs & Bartles, 2001
Esmeraldacaris Waggoner, 2003
Esslingeria Chabaud & Bain, 1976
Estoniadiscus Peel, 2003
Estrellichnus Uchman & Wetzel, 2001
Etacystis Nitecki & Schram, 1976
Ethiolaimus Siddiqi, 2000
Ethmocoscinidae
Ethmocoscinus Simon, 1939
Ethmocyathidae
Ethmodora Khera, 1975
Ethmolynthus Zhuravleva, 1963
Ethmophyllidae
Etterwindichnus Walter, 1983
Eucamptus Dujardin, 1844
Euchromanema Kulikov & Dashchenko, 1991
Euconchitina
Euconochitina Taugourdeau, 1966
Eucyathostomum Molin, 1861
Eudesmodora Allgén, 1932
Eudiplogasterium Meyl, 1960
Eudromoxyura Anderson & Prestwood, 1972
Eudronema Remillet & Van Waerebeke, 1973
Eugenuris Schulz, 1948
Eugyrichnites Ami, 1905
Eumermis Daday, 1911
Eumonodontus Railliet & Henry, 1910
Euodontophora Allgén, 1936
Euproopichnus Walter, 1983
Euraonhystera Andrassy, 1981
Eurychitina Tsegelnyuk, 1982
Euryconema Chitwood, 1932
Eurygonum Schmidt, 1992
Eurymermis Müller, 1931
Euryscolex Müller & Hinz-Schallreuter, 1993
Eurytholia Sutton, Holmer & Cherns, 2001
Eustoma Beneden, 1871
Eustrongilus Fedtschenko, 1874
Eustrongylus Diesing, 1851
Evaginorhabditis Sultan, Kaul & Chhabra, 1985
Evandroia Travassos, 1937
Evansia Railliet & Henry, 1913
Exallopus Harris, Johnson, Hicks & Tauxe, 1996
Excisa Gendre, 1928
Exilithecidae
Expressonema Smolyanko & Belogurov, 1991
Ezonema Boyce, 1971
Facivermis Hou & Chen, 1989
Falcatipes Sarjeant & Langston, 1994
Falcichnites Stepanek & Geyer, 1989
Fallocyathidae
Fallocyathus
Falsocyathus Fonin, 1966
Fanerocoelia Kozur & Mostler, 1972
Fangxianites Duan, 1984
Fansycyathus
Farooqifilaria Jairajpuri & Siddiqi, 1970
Fasciarichnus Wang & Wang Ning, 1995
Fasciculus Radtke, 1991
Fascifodina Osgood, 1970
Fascionema Nasarova & Fedorov, 1979
Fastigiurus Babaev, 1966
Favilynthus Debrenne, 1974
Feddenichnus Chiplonkar & Borkar, 1973
Fenestrocyathus
Fenhsiangia Long & Burrett, 1989
Fescia Truskova & Eroshenko, 1977
Fezzanichnium Novak, 1990
Fibaria Anacker, 1903
Fichterichnus Holub & Kozur, 1983
Fictitium Diesing, 1851
Fictovichnus Johnston, Eberth & Anderson, 1996
Filarina Hammerschmidt, 1838
Filarinema Mönnig, 1929
Filariopsis Van Thiel, 1926
Filarissima Chabaud, 1974
Filicapitis Travassos, 1949
Filidiscolaimus Siddiqi, 1995
Filidorylaimellus Jairajpuri & Ahmad, 1980
Filipjevella Lazarevskaya, 1965
Filipjevimermis Polozhentzev & Artyukhovski, 1958
Filipjevinema Allgen, 1953
Filliphinema Roy & Gupta, 1974
Filostrongylus Mackerras, 1955
Fimbritubichnus Gluszek, 1998
Finlaynema Vigueras, 1934
Fissicauda Durette-Desset & Krishnasamy, 1976
Fitzsimmonsnema Petter, 1966
Flabellichnus Netto, 1992
Flagicaudoides Khan, Singh & Baird, 1999
Fleaglellius Genise & Bown, 1994
Flexanulus Debrenne, 1975
Flexicyathus Kruse, 1978
Flexorhaphe Kappel, 2003
Flindersicyathidae
Florencioia Travassos, 1920
Florichnus Bi, Guo & Qian, 1996
Flyschichnium Novak & Peslova, 1986
Foesterichnus Pirrie, Feldmann & Buatois, 2004
Foliostoma Beveridge & Johnson, 1981
Fontesia Travassos, 1928
Fontonema Chitwood, 1930
Forfarella Dunlop, Anderson & Braddy, 1999
Formilaria de Filippi, 1847
Formosocyathus
Fortiforceps Hou & Bergstrom, 1997
Fossichnus Nielsen, Nielsen & Bromley, 2003
Fossilicyathus Korshunov, 1983
Fragilicyathidae
Fragilicyathus
Francofilaria Jairajpuri & Siddiqi, 1970
Francolinema Jairajpuri & Siddiqi, 1970
Fransuasaecyathidae
Fransuasaecyathus Zhuravleva, 1960
Freitasascaris Sprent, 1983
Freitascapillaria Moravec, 1982
Freitasoxyascaris Gomes & Motta, 1967
Fridaycyathus Gravestock, 1984
Frinalicyathus Debrenne, Rozanov & Zhuravleva, 1974
Fuchsia Micoletzky, 1922
Fuellebornema Trevassos & Darriba, 1929
Fuellebornius Leiper, 1926
Fuersichnus Bromley & Asgaard, 1979
Fundalutum Senowbari-Daryan & Kuss, 1992
Fungochitina Taugourdeau, 1966
Furconema Gairola & Malhotra, 1988
Furculosus Roniewicz & Pienkowski, 1977
Furia Linnaeus, 1768
Furnasichnus Borghi & Fernandes, 2001
Fusarella Seurat, 1916
Fusaria Zeder, 1800
Fuscheila Siddiqi, 1982
Fuscinapeda Sarjeant & Langston, 1994
Fustichitina Achab, 1980
Fuxinia Liu, 1990
Gabrielsocyathus
Gagarinicyathidae
Gagarinicyathus
Gaigeria Railliet & Henry, 1910
Galebia Chitwood, 1932
Galebiella Basir, 1941
Galeiceps Railliet, 1916
Galeonema Filipjev, 1927
Galicornidae
Galinaecyathus Konyushkov, 1964
Galinanema Spiridonov, 1984
Gallifilaria Jain, Alwar, Awadhiya & Pandit, 1965
Galoncus Railliet, 1918
Galophinema Siddiqi, 1965
Gamalites Marek, 1974
Gambapes Sarjeant & Langston, 1994
Gangtoucunia Luo & Hu, 1999
Gaparella Missarzhevskij, 1981
Garkavillanus Lomakin & Chernova, 1980
Gastreochrea Valkov, 1982
Gastrochaeta Grimm, 1877
Gastronodus Singh, 1934
Gastropodichnus Yao, 1993
Gastrotricha Metschnikoff, 1865
Gatagacyathidae
Gatagacyathus Debrenne & Zhuravlev, 1992
Gatesnema Timm, 1971
Gazellofilaria Yeh, 1955
Gedoelstascaris Sprent, 1978
Gehlingia McMenamin, 1998
Gelanocaulus Asadov, 1958
Gelenoptron Conway Morris, 1993
Gendrespirura Chabaud, 1958
Gendria Baylis, 1930
Geniculicyathus Debrenne, 1960
Geocyathidae
Geocyathus Zhuravleva, 1960
Gephyronema Linstow, 1903
Geresia Missarzhevskij, 1981
Gerlachystomina Inglis, 1962
Gerthornus Massey, 1966
Geyericoscinidae
Geyericoscinus Debrenne & Zhuravlev, 2000
Gibronea Pierce, 1964
Gilesia Sarwar, 1956
Gilsonema Hunt, 1998
Gilsonia Gedoelst, 1919
Ginospina Missarjevsky, 1989
Gireterakis Lane, 1917
Glaber Travassos & Kloss, 1958
Glaciichnium Walter, 1985
Glasbachichnium Walter, 1983
Glauxinemella Gagarin, 1998
Glebosocoprolithus Bischoff, 1994
Glirotremmorpha Collinson & Hooker, 2000
Globifructus Geng & Zhang, 1987
Globocephalonema Anand & Rao, 1987
Globochona Moravec, 1972
Globomicritina Nagy, 1989
Globosocyathidae
Glochidorella Siddiqi, 1981
Glockeria Ksiazkiewicz, 1968
Glockerichnus Pickerill, 1982
Glomerinema Van Waerebeke, 1985
Gloriosocyathidae
Gloriosocyathus
Gluteus Davis & Semken, 1975
Glyphichnus Bromley & Goldring, 1992
Glyptites Duan & Xiao, 1992
Gnaltacyathus Kruse, 1982
Gnathichnus Bromley, 1975
Gnathostomulida Sterrer, 1972
Gobindonema Sood & Parshad, 1974
Gochtia Eisenack, 1968
Godulaichnium Plicka, 1986
Goferus Jairajpuri & Ahmad, 1992
Goldfingia
Golovatchinema Spiridonov, 1984
Goniadichnites Matthew, 1891
Goniclis Rafinesque, ?, 1818
Goniophycus Saporta, 1884
Gonipora Link, 1807
Gonofilaria Mullin, 1973
Gopalus Khan, Jairajpuri & Ahmad, 1988
Gopheruris Petter & Douglass, 1976
Gordia Emmons, 1844
Gordiomermis Heinze, 1934
Gordiopsis Heer, 1865
Gordonicyathellus Yazmir, 1975
Gordonicyathus
Gordonifungia Rozanov, 1964
Gorskinocyathus Vologdin, 1960
Gotlandochitina Laufeld, 1974
Gottholdsteineria Andrássy, 1958
Gracilichnus Yang & Shen, 1999
Gracilocyathus Vologdin & Jankauskas, 1968
Gracilpaurus Ganguly & Khan, 1990
Grammichnus Hitchcock, 1865
Grandicyathus Korshunov, 1983
Granichnium Muller, 1980
Granulinema Moravec & Little, 1988
Granulites Rafinesque, 1831
Graphidiella Olsen, 1948
Graphidioides Cameron, 1923
Graphidiops Lent & Freitas, 1938
Graphinema Guerrero & Rojas, 1969
Graphoscyphia Debrenne, 1974
Graphoscyphus
Grossularia Granzow, 1989
Gruhneria Sarwar, 1956
Gryllocola Basir, 1942
Gryllonema Kakuliya, 1968
Guandacolichnus Pazos, 2000
Guanshania Liu & Gao, 1992
Gubernacules Rasheed, 1960
Gubernaculimermis Ipatyeva & Pimenova, 1985
Guerrerostrongylus Sutton & Durette-Desset, 1991
Gumbycyathus Kruse, 1982
Gurltia Wolffhügel, 1933
Guyanema Petter, 1975
Gymnotyleptus Ahmad & Jairajpuri, 1982
Gynaecometra Araujo, 1978
Gynaecophila Gubanov, 1950
Gynopoecilia Chabaud, Golvan, Bain & Brygoo, 1965
Gyrichnites Whiteaves, 1883
Gyrochorda Schimper, 1879
Gyrochordae Schimper, 1879
Gyrochorte O. Heer, 1864
Gyrolithes Saporta, 1884
Hadronchoides Jairajpuri & Rahman, 1983
Hadronchulus Ray & Das, 1982
Hadrosaurichnoides Casanovas Cladellas, Ezquerra Miguel, Fernandez Ortega, Perez-Lorente, Santafe Llopis & Torcida Fernandez, 1994
Haemastoma Prudente, 1843
Haematozoon Leisering, 1865
Haemostrongylus Railliet & Henry, 1907
Hagenetta Hahna & Pflug, 1988
Haguenowia Etallon, 1860
Haguia Walcott, 1899
Halimedides J. Lorenz von Liburnau, 1902
Haliocerasum Ryckholt, 1862
Halkieria Poulsen, 1967
Halkieriidae Poulsen, 1967
Halliphinema Conn & Sher, 1972
Hallotheca Malinky, Linsley & Yochelson, 1987
Hallotheca Boucek, 1936
Hallucigenia Conway Morris, 1977
Halochitina Eisenack, 1968
Halodorylaimus Andrassy, 1988
Halometra Oppenheim, 1888
Halucigeniidae
Halymenites Bronn, 1834
Halysichnus Hitchcock, 1858
Halysicyathus Debrenne, 1965
Hamania Travassos, 1915
Hamannia Travassos, 1915
Hamipes Hitchcock, 1858
Hamullaria Slawikowski, 1819
Hamulofilaria Chandler, 1924
Hanadirella El-Khayal, 1985
Hanshuiella Yue, 1984
Haplacis Railliet & Henry, 1916
Haplochitina Grignani & Mantovani, 1964
Haplodidentus Naidu & Thakare, 1981
Haplonema Ward & Magath, 1916
Haplotichnus Miller, 1889
Haptotrlcoma Lorenzen, 1977
Harentinema Chabaud & Brygoo, 1957
Harinellites Kozur & Mostler, 1972
Haroldakis Inglis, 1991
Harthia Simroth, 1907
Hartsellea Rindsberg, 1994
Harttia Walcott, 1884
Harttites Howell & Knight, 1936
Hartwichia Chabaud & Bain, 1966
Hasanuddinia Hasegawa & Syafruddin, 1994
Hatcherichnus Foster & Lockley, 1997
Haularia Lee, 1840
Hauthaleia Borrello, 1967
Hawkercyathus Gravestock, 1984
Hebeiella Liu, 1990
Heckericyathus Zhuravleva, 1960
Heckerina Alekseev & Endelman, 1989
Hedriumichnus Braddy & Briggs, 2002
Heftebergichnus Walter, 1983
Heimdallia Bradshaw, 1981
Hekarella Hunt & Mohotti, 2000
Helanoichnus Yang, 1985
Helenia Walcott, 1889
Helicobelondira Yeates, 1972
Helicodromites Berger, 1960
Helicoichnus Yang, 1986
Helicorhape Ksiazkiewicz, 1970
Helicosalpinx Oekentorp, 1969
Helicothrix Galeb, 1878
Helicotrix Galeb, 1878
Heligmobaylisia Mawson, 1961
Heligmodendrium Travassos, 1937
Heligmodentostoma Skrjabin & Shultz, 1952
Heligmonella Monnig, 1927
Heligmonina Baylis, 1928
Heligmonoides Baylis, 1928
Heligmoskrjabinia Freitas & Lent, 1937
Heligmospiroides Ortlepp, 1939
Heligmostrongylus Travassos, 1917
Heliomiria Sedlak, 1977
Helmins Schlotthauber, 1860
Helminthites Salter, 1857
Helminthoidichnites Fitch, 1849
Helmintholites Murchison, 1867
Helmintholithes Etheridge, 1881
Helmintholithus Linnaeus, 1768
Helminthorhaphe Seilacher, 1977
Helminthoxys Freitas, Lent & Almeida, 1937
Helminthus Dunglison, 1895
Hemichordata Bateson, 1885
Hemisphaeriella Porter, Meisterfeld & Knoll, 2003
Hemithalamocyathus
Hempelia Vaz, 1936
Henryella Neveu-Lemaire, 1924
Hepatinema Rasheed, 1964
Hepatocapillaria Moravec, 1987
Hepatojarakus Yeh, 1955
Hercochitina
Hercolepadidae
Herpestostrongylus Khera, 1956
Herpetostrongylus Baylis, 1931
Herpocystus Pomel, 1869
Hetcochitina
Heterakoides Teixeira de Freitas, 1956
Heteroanguina Chizhov, 1980
Heterobolbus Railliet, 1896
Heterobulura Skrjabin & Shikhobalova, 1948
Heterocephalus Marion, 1870
Heterodorus Altherr, 1952
Heterolamellia Sheng, 1991
Heteromyoxyuris Quentin, 1974
Heteropleuronema Andrassy, 1970
Heteropodichnus Walter, 1983
Heteropolacopros Hunt, Lucas & Lockley, 1998
Heterostrongylus Travassos, 1925
Heterotripodichnus Walter, 1983
Heteroura von Siebold, 1836
Heteroxynema Hall, 1916
Hexactinolaimus Yeates, 1972
Hexadorus Ivanova & Shagalina, 1983
Hexaella Milanovic, 1989
Hexapapillostomum Lomakin, 1991
Hexastoma Rolando, 1841
Hexodontostomum Ihle, 1920
Heydonius Taylor, 1935
Heynsaxonchium Coomans & Nair, 1975
Hilgertia Quentin, 1974
Hillichnus Bromley, Uchman, Gregory & Martin, 2003
Himatidiophila Rahm, 1925
Hippopharangites Bengtson, 1990
Hippotrum Luo & Hu, 1999
Histeocephalus Molin, 1860
Histiocephalus Diesing, 1851
Histiostrongylus Molin, 1861
Hitachia Hatai & Noda, 1972
Hoazinstrongylus Magalhães Pinto & Corrêa Gomes, 1985
Hobmaierostrongylus Boev, 1950
Hoegisphaera Staplin, 1961
Hoepplius Chu, 1931
Hoineffia Diaw, 1977
Holodiplogaster Meyl, 1960
Homalostomum Beneden
Homogma Siddiqi Tylenchida, 1986
Homularia Meyer, 1794
Hondichnus Ausich, 1979
Hooperstrongylus Lie & Kong, 1963
Hoplodontophorus Turner, 1922
Hoplorhynchus Andrassy, 1985
Hoploridiidae
Hormosiroidea Schaffer, 1928
Horodyskia Yochelson & Fedonkin, 2000
Hostynichnium Plicka & Siranova, 1989
Hsiungia K'ung & Yang, 1964
Huaiyuanella Xing, Yan & Yin, 1984
Hudsonia Leroux, 1940
Hugotnema Durette-Desset & Chabaud, 1981
Huizenodus He & Xie, 1989
Humilis Rouault, 1850
Hupecyathellidae
Hupecyathellus
Hupecyathidae
Hupecyathus Debrenne, 1964
Hyalochitina Paris & Grahn, 1999
Hydropsis Örsted, 1844
Hyolithellidae Walcott, 1886
Hypaxonchium Coomans & Nair, 1975
Hyperocoprolithus Bischoff, 1990
Hypocristata Durette-Desset, 1971
Hypodontus Mönnig, 1929
Hypostomum Stewart, 1898
Hyptocyathus Kruse, 1978
Hyracofilaria Ortlepp, 1938
Hysteracrum Railliet & Henry, 1913
Hysterolithes Link, 1807
Hystrignathus Leidy, 1850
Ibadanus Siddiqi, 1983
Ibrahimia Khalil, 1932
Ichnogyrus Bown & Kraus, 1983
Ichnospongiella Rigby, Xichun & Jiasong, 1998
Ichnusocyathus Debrenne, 1977
Ichnyspica Linck, 1949
Ichnytes Vinassa de Regni, 1904
Ichthyocephaloides Hunt & Sutherland, 1984
Ichthyospirura Skrjabin, 1917
Ichthyostrongylus Mawson, 1954
Icthyocephalus Artigas, 1926
Idiochitina Tsegelnyuk, 1982
Idiuoxyuris Hugot, 1988
Ierestrongylus Cameron, 1935
Ignotia Roemer, 1852
Iheringascaris Pereira, 1935
Ihleia Travassos & Vogelsang, 1932
Iljinicyathus
Illichitina Collinson & Schwalb, 1955
Ilmenichnus Hecker, 1980
Imbrichnus Hallam, 1970
Imosmermis Rubzow, 1981
Impalaia Mönnig, 1923
Imparispiculus Luo Jianzhong, Duo Jiecaidan & Chen Gang, 1988
Implimicritina Nagy, 1989
Inacyathella Debrenne, 1977
Inagreius Khan, 1982
Inamichnis Nakazawa & Yoshimatsu, 1980
Inarimus Rafinesque, 1815
Incanema Andrassy, 1997
Incurvocyathus Rozanov, 1966
Indaphelenchus Bajaj, Bishnoi & Dabur, 1995
Indiana Chakravatz, 1943
Indocamallanus Chakravarty, Majumdar & Sain, 1963
Indocapillaria De & Maity, 1995
Indokochinema Darekar & Khan, 1979
Indorhabditis Chaturvedi & Khera, 1979
Inessia Pyanovskaya, 1981
Inessocyathellus Beljaeva, 1974
Inessocyathus Debrenne, 1964
Inglamidum Durette-Desset, Denke & Murua, 1976
Inglechina Chabaud, Seureau, Beveridge, Bain & Durette-Desset, 1980
Inglisakis Freitas, Vicente & Santos, 1969
Inglisinema Platonova, 1984
Inglisonema Mawson, 1968
Inglisubulura Devamma, 1977
Ingloxyuris Chabaud, Petter & Golvan, 1961
Inkrylovia Fedonkin, 1979
Insignicornis Sysoev, 1973
Interrotylenchus Eroshenko, 1984
Intexalvichnus Buckman, 1997
Iota Cobb, 1913
Iotonchulus Andrassy, 1993
Ipatjevimermis Mukhamedzyanova, 1980
Ipsaphelenchus Lieutier & Laumond, 1978
Irhoudicoscinus Debrenne, 1977
Irichnus Skompski, 1991
Irinaecyathus Zhuravleva, 1974
Irinella Kozur & Mostler, 1972
Irukanema Yamaguti, 1951
Isacis Diesing, 1861
Isakis Lespès, 1856
Isiticyathus
Isitithecidae
Isnardia Borrello, 1967
Isnella Senowbari-Daryan, 2007
Isobinema Rao, 1958
Isopodichnus Bornemann, 1889
Isospiculus Ali, 1957
Isothela Railliet, 1925
Isthmocyathus Vologdin, 1977
Isthmusimermis Gafurov, 1980
Isvilina Schallreuter, 2003
Itirindia Hermann, 2002
Iuloeidocoprolites Buckland, 1829
Ivaschkinonema Erkulov, 1975
Ivotylenchulus Hashim, 1983
Jairajpuria Baqri & Jana, 1980
Jakutocarinidae
Jakutocarinus Zhuravleva, 1960
Jakutocyathus Zhuravleva, 1960
Jamesonichnites Dam, 1990
Jamilius Siddiqi, 1983
Jangudacyathus Yazmir, 1975
Japhanicyathus
Jarryella Van Waerebeke & Remillet, 1973
Javellia Ricci, 1939
Jaycea Landing, 1995
Jebileticoscinidae
Jebileticoscinus Debrenne, 1977
Jenkinochitina Paris, 1981
Jiayinsauropus Dong, Zhou & Wu, 2003
Jibacoa Coy-Otero, Garcia & Alvarez, 1993
Jincelites Valent, Fatka, Micka & Szabad, 2009
Jinkenites Yu Wen, 1988
Jinningichnus Li & Yang, 1988
Joanaecyathus Gravestock, 1984
Johnpearsonia Durette-Desset, Ben Slimane, Cassone, Barton & Chabaud, 1994
Johnstonema Yeh, 1957
Johnstonmawsonoides Machida, 1975
Josefilaria Moorhouse, Bain & Wolf, 1980
Jugalicyathidae
Jugalicyathus Gravestock, 1984
Julinea Sánchez, 1955
Juricyathus Debrenne, 1974
Justinema R'kha & Durette-Desset, 1991
Kaimuria Ghare & Badve, 1977
Kaiyangites Qian & Yin, 1984
Kalicephaloides Yeh, 1956
Kallidorylaimus Andrassy, 1989
Kalnaichnus Holub & Kozur, 1983
Kalochitina
Kalohipus Fuentes Vidarte & Meijide Calvo, 1998
Kaloscolex Müller & Hinz-Schallreuter, 1993
Kaltatocyathidae
Kaltatocyathus Rozanov, 1964
Kamegainema Hasegawa, Doi, Araki & Miyata, 2000
Kameschkovia Zhuravleva, 1956
Kamptozoa
Kamyshovaecyathus Yazmir, 1975
Kandatocyathus Kashina, 1979
Kantbhala Siddiqi, 1981
Karaburunella Kozur, 1997
Kasyriccyathidae
Kaszabospirura Meszaros, 1975
Katbergia Gastaldo & Rolerson, 2008
Kathleena Leiper & Atkinson, 1914
Kazachstanicyathus Konyushchkov, 1967
Kazakhstanotubulus Gridina, 1991
Kazlycyathus Borodina, 1974
Kechikacyathus Debrenne & Zhuravlev, 1992
Keidelasma Borrello, 1967
Kelanella Rozanov & Missarzhevsky, 1966
Kelanellidae
Kellericyathus Rozanov, 1973
Kembrinaria Korde, 1989
Kennardia Laurie, 1986
Kennardiidae
Kentropyxia Baker, 1982
Keriocyathidae
Keriocyathus Debrenne & Gangloff, 1990
Kerneria Meyl, 1960
Kettwigiella Schmidt, 1954
Khagnura Esakova, 1996
Khalilia Neveu-Lemaire, 1924
Khatyspytia Fedonkin, 1985
Khirgisocyathus Voronin, 1988
Kidjasocyathus
Kidrjasocyathidae
Kidrjasocyathus Rozanov, 1960
Kiehnensus Tuftin & Kyllo, 1978
Kiivermus Katto, 1975
Kijacyathidae
Kijacyathus Zhuravleva, 1959
Kiluluma Skrjabin, 1916
Kinorhyncha Reinhard, 1881
Kinzeria Garcia-Bellido Capdevila & Conway Morris, 1999
Kirjanovia Ivanova, 1976
Kisasacyathus
Kittia Sedlmeier, 1931
Kittydorylaimus Andrassy, 1999
Kivanichnus Holub & Kozur, 1983
Kiwicyathus Debrenne & Kruse, 1986
Kiyafungia Boyarinov, 1997
Kleninia Pyanovskaya, 1981
Klossiella Gonçalves da Costa, 1960
Klossinemella Gonçalves da Costa, 1961
Klossnema da Silva Cordeiro & de Toledo Artigas, 1986
Kochostrongylus Shultz & Boev, 1952
Kockurus Chlupac, 1995
Koksodus Missarzhevskij, 1981
Kolbicyathus Zhuravlev, 1988
Kolodorylaimus Andrassy, 1999
Konbergichnium Walter, 1978
Konjuschkovicyathidae
Konjuschkovicyathus Debrenne & Zhuravlev, 2000
Konyriidae
Kordecyathidae
Kordecyathus Missarzhevsky, 1961
Koriakinema Oshmann, 1949
Korilacus Missarjevsky, 1989
Korovinella Khalfina, 1960
Korovinellidae
Korshunovicyathus Zhuravlev, 1988
Kosticyathus Debrenne & Zhuravlev, 2000
Kotuites Missarjevsky, 1989
Kotuyicoscinus Sundukov, 1983
Kotuyicyathellus Osadchaya, 1979
Kotuyicyathus Zhuravleva, 1960
Krasnopeevacyathus
Krasnopeevaecyathus Repina, 1964
Krausichnus Genise & Bown, 1994
Krefftascaris Sprent, 1980
Kreisiella Jones, 1985
Krishnanicyathus Vologdin, 1964
Krugiphinema Cohn & Sher, 1972
Kruseicnema Debrenne, Gravestock & Zhuravlev, 1990
Kruseicnemididae
Kruseicyathus Boyarinov & Konyaeva, 1997
Kryptolagena Flugel, 1980
Kuala Durette-Desset & Krishnasamy, 1976
Kulparina Conway Morris & Bengtson, 1990
Kundatoides Aksarina, 1995
Kunjudorylaimus Dhanam & Jairajpuri, 2000
Kunstleria Delage, 1899
Kuntzistrongylus Lichtenfels, 1980
Kurikania Tzalolikhin, 1976
Kurilonema Shcherbak & Sharpilo, 1969
Kurshymermis Zahidov & Poinar, 1970
Kutassicaulus Skrjabin, 1933
Kyarocyathus Kruse, 1982
Kymbecyathidae
Kymbecyathus Debrenne & Kruse, 1986
Labiatofilaria Adams, 1933
Labiodapa Quentin, 1970
Labiomultiplex Smales, 1994
Labiosimplex Smales, 1994
Labyrinthochitina Bykova, 1961
Labyrinthostoma Cobb, 1898
Labyrinthus Kobluk, 1979
Labyrintichnus Uchman & Alvaro, 2000
Lacazia Quatrefages, 1866
Lacerathus Yankauskas, 1965
Laceratus
Lachrymatichnus Yang & Yin, 1982
Lacrima Duan & Cao, 1989
Lacrimichnus Santos, Mayoral & Muniz, 2003
Ladaecyathus Zhuravleva, 1960
Ladinella Kraus & Ott, 1968
Ladonus Rafinesque, 1815
Lagenicyathus Vologdin, 1964
Lagenochitina Eisenack, 1931
Lagenosipho Spandel, 1898
Lagenula Luo & Hu, 1999
Lagocheilascaris Castellani & Chalmers, 1913
Lagochilascaris Leiper, 1909
Lagostonema Sutton & Durette-Desset, 1987
Lagostrongylus Fukumoto, Kamiya & Ohbayashi, 1986
Lamanema Becklund, 1963
Lambdachitina Lakova, 1986
Lambertia Brzeski, 1977
Lamellitubus Kraus & Ott, 1968
Lamellivallia Sheng, 1991
Laminaecyathus Yazmir, 1966
Lamniporichnus Mikulas, Dvorak & Pek, 1998
Lamuania Tzalolikhin, 1976
Landercyathus Debrenne & Gangloff, 1990
Lanicoidichna Chamberlain, 1971
Lanicyathidae
Lanicyathus Belyaeva, 1975
Lanzavecchia Zullini, 1988
Laphyctes Dujardin, 1844
Lapispecus Voigt, 1970
Lapistamnia Duan, Cao & Zhang, 1993
Lapworthellidae Rozanov & Missarzhevsky, 1966
Laqueichnus Kappel, 2003
Laqueiichnus Gekker, 1983
Larecyathus Kashina, 1979
Largodictyon Vialov & Golev, 1965
Lasiomitus Marion, 1870
Latibuccana Patwardhan, 1935
Laticorpus Van Waerebeke, 1970
Latocephalus Patil & Khan, 1982
Laufeldochitina Paris, 1981
Lauratonemella Chesunov, 1984
Lauroia Proença, 1938
Lauronema Almeida, 1938
Laurostrongylus Durette-Desset & Chabaud, 1992
Lawtonema Siddiqi, 1999
Laxamphidelus Siddiqi, 1993
Laxicavia Duan, Cao & Zhang, 1993
Laymanicaecum Mozgovoi, 1951
Lazaichnus Mikulas & Genise, 2003
Leaphididae Shcherbakov, 2010
Lecanocephalus Diesing, 1839
Lechratichnus Yang, 1992
Leecyathus Vologdin, 1957
Legnodesmus Ehlers, 1869
Leibaella
Leibaellidae
Leidynemella Chitwood, 1934
Leiochitina Tsegelnyuk, 1982
Leiocyathus Vologdin, 1959
Leiperenia Khalil, 1922
Leiperiatus Sandground, 1929
Leipernema Narayan Singh, 1976
Leiperotylenchus Manohar Das, 1960
Leipoanema Johnston & Mawson, 1942
Leipotylenchus Sher, 1973
Leiuris Leuckart, 1850
Lemdanella Sonin, 1963
Lemurostrongylus Chabaud, Brygoo & Petter, 1961
Lenargyrion Bengtson, 1977
Lendix Rafinesque, 1815
Lenocyathidae
Lenocyathus Zhuraleva & Zelenov, 1955
Leoberginema Tsalolikhin, 1977
Lepidocoelidae
Lepidonema Cobb, 1898
Leprirophus Skrjabin, Sobolev & Ivaschkin, 1965
Leptichnus Taylor, Wilson & Bromley, 1999
Leptodera Dujardin, 1844
Leptonchulus Chawla, Bhamburkar, Khan & Prasad, 1968
Leptonema Jairajpuri, 1964
Leptoptilostipus Payros, Astibia, Cearreta, Pereda-Suberbiola, Murelaga & Badiola, 2000
Leptosocyathellus Osadchaya, 1979
Leptosocyathus
Leptotylencholaimus Jairajpuri & Ahmad, 1992
Lepturis Schlotthauber, 1860
Lepturus Leuckart, 1848
Lepusius Farooq & Khatoon, 1995
Lerouxiella Chabaud & Durette-Desset, 1974
Lerouxinema Singh, 1949
Lesjan Brzeski, 1985
Lesneiidae
Liantuoella Duan & Cao, 1989
Libodiscus Conway Morris, Savoy & Harris, 1991
Licrophycus Miller & Dyer, 1878
Lidaconus Onken & Signer, 1988
Ligabueichnium Leonardi, 1984
Limaconema Mengert, 1953
Limolepis Kozur & Mostler, 1972
Limonnema Guerrero, 1971
Limulava Størmer, 1959
Limuludichnus Linck, 1949
Lineatichnus Walter, 1983
Linguatula Schrank, 1796
Lingulichnus Hakes, 1976
Linhomomius Bastian, 1865
Linochitina Eisenack, 1968
Linoichnus Yang, 1984
Linstowiella Basir, 1956
Liorhynchus Rudolphi, 1801
Liorhynhus de Blainville, 1820
Liorichita Liu, 1987
Liorrhynchus Olfers, 1816
Liorynchus Dujardin, 1844
Liptovichnium Plicka, 1987
Lirchynchus Rudolphi, 1802
Lirquenichnus Bandel & Quinzio-Sinn, 1999
Lissochitina Tsegelnyuk, 1982
Lithiphus Rafinesque, 1818
Litholites Mikulas, 1991
Lithoplaision Diblin, Randazzo & Jones, 1991
Litocoprolithus Bischoff, 1990
Litosoma van Beneden, 1873
Loaina Eberhard & Orihel, 1984
Lobatorobius Skrjabin & Shikhobalova, 1951
Lobichnus Kemper, 1968
Lobiochrea Val'kov & Sysoev, 1970
Lobocephalus Diesing, 1838
Lobuloma Rafinesque, 1832
Lockenloia Adamson & Caira, 1991
Loculicyathellus Debrenne, 1969
Loculicyathidae
Loculicyathopsis Boyarinov, 1997
Loculicyathus Vologdin, 1931
Lomasulcachites Qian & Jiang, 1982
Lomatiocyathus Vologdin, 1964
Lombricoides Mérat, 1821
Lomosovis Fedonkin, 1983
Loncoma Rafinesque, 1832
Longaevus Yankauskas, 1965
Longfengshania Du Rulin, 1982
Longicyathus Vologdin, 1964
Longidorylaimoides Jairajpuri & Ahmad, 1992
Longimermis Camino & Stock, 1990
Longiocrea
Longior Travassos & Kloss, 1958
Longistrioides Yeh, 1958
Longshanichnus Yang, 1985
Loofilaimus Jairajpuri, Ahmad & Sturhan, 1998
Lopadocoprolithus Bischoff, 1994
Lophodesmus Tesakov & Alekseev, 1992
Lophortofilaria Wehr & Herman, 1956
Lophotheca Qian
Lopochites Qian Yi, 1977
Loricifera Kristensen, 1983
Lossinia Ivantsov, 2007
Loxodontofilaria Berghe & Gillain, 1939
Lucyathus Vologdin, 1957
Lugoviella Grigorieva, 1983
Lukonema Chabaud & Bain, 1974
Lumbricalitube Tan, 1997
Lumbricaria Münster, 1831
Lumbricellus Chiaje, 1844
Lumbricicola Friedlaender, 1895
Lumbricites Goldfuss, 1833
Lunachites Qian & Yin, 1985
Lunaepes Gand, Demathieu & Ballestra, 1995
Lunatubichnus Trewin & McNamara, 1995
Lunichnium Walter, 1983
Lunula Hitchcock, 1865
Lunulacyathidae
Lunulacyathus Debrenne, 1973
Luolishania Hoy & Chen, 1989
Luonanconcha Jian & Hu, 1993
Lusatichnlum Walter, 1985
Lushanichnus Hu & Meng, 1991
Lutznema Lent & Freitas, 1934
Luzonema Rodrigues, Varela, Rodrigues & Cristofaro, 1973
Lycolaimus Rahm, 1928
Lynxrufus Stough, 1953
Lyorhynchus Risso, 1826
Mabiania He, 1984
Macacanema Schad & Anderson, 1963
Macanopsis Macsotay, 1967
Macgowanella Nelson & Bolton, 1980
Macielia Travassos, 1935
Mackenziecyathus
Mackerrastrongylus Mawson, 1960
Macrocephalus Luo & Hu, 1999
Macrochromadora Kreis, 1929
Macrocriconema Minagawa, 1986
Macropicola Mawson, 1978
Macroponema Mawson, 1978
Macropostrongylus Yorke & Maplestone, 1926
Macropoxyuris Mawson, 1964
Macrorhynchus Sultan, Singh & Sakhuja, 1991
Macrostrongylus Ow Yang, Durette, Desset & Ohbayashi, 1983
Macrotobrilus Tsalolikhin, 1981
Madafilaroides Chabaud & Brygoo, 1961
Madangiostrongylus Chabaud & Brygoo, 1961
Madathamugadia Chabaud, Anderson & Brygoo, 1960
Madelinema Schmidt & Kuntz, 1971
Madinema Khan, Chawla & Saha, 1976
Madochotera Bain & Brunhes, 1968
Madoxyuris Chabaud, Brygoo & Petter, 1965
Maennilia Rozhnov & Jefferies, 1996
Magnoculocaris Briggs & Bartels, 2002
Magnoculus Briggs & Bartels, 2001
Maiakarichnus Verde & Martinez, 2004
Maiandrocyathus Debrenne, 1974
Mainspinostrongius Kalyankar & Palladwar, 1989
Makifilaria Krishnasamy, Singh & Iyamperumal, 1981
Malaistrongylus Ow Yang, Durette, Desset & Ohbayashi, 1983
Malayocamallanus Jothy & Fernando, 1971
Malayometastrongylus Gibbons & Krishnasamy, 1986
Maldybulakia Tesakov & Alekseev, 1998
Malis Chisholm, 1815
Malvinensis Wind, Dinkelman & Wise, 1977
Mammanidula Sadovskaya, 1952
Mammaria Müller, 1776
Mammaticyathus Vologdin, 1977
Mammillichnis Chamberlain, 1971
Mammillomacracis Dosse, 1939
Mammillonema Darekar & Khan, 1982
Mammolongistriata Dubinin, 1953
Manacyathidae
Manacyathus
Manistrongylus Cameron & Myers, 1960
Mansonella Faust, 1929
Maplestonema Johnston & Mawson, 1939
Maracaya Diaz-Ungria, 1964
Margachitina Eisenack, 1968
Margaritichnus Bandel, 1973
Margaronchulus Andrassy, 1973
Margennipes Heyler, 1984
Margimicritina Nagy, 1989
Marginicyathus Vologdin, 1977
Margolisianum Blaylock & Overstreet, 1999
Mariostrongylus Freitas & Franco, 1967
Mariporrocaecum Sheenko, 1985
Marispelodera Belogurov, 1977
Markocyathus Debrenne, 1989
Marsupostrongylus Mackerras & Sandars, 1953
Martadamsonius Van Waerebeke, 1987
Maseria Rausch & Rausch, 1983
Masrichnus Bown, 1982
Mastigades Zeder, 1803
Mastigodes Blainville, 1828
Mastigoides Lamarck, 1816
Mastigonema Dailey & Perrin, 1973
Mastigospirura Machida & Syahailatua, 1994
Mastonema Mawson, 1961
Mattajacyathus Rozanov, 1973
Matthesonema Osche, 1955
Maturocyathus Fonin, 1985
Maupasiella Seurat, 1913
Mawsonfilaria Anderson & Chabaud, 1958
Mawsonicoscinidae
Mawsonicoscinus Debrenne & Kruse, 1986
Maxomystrongylus Hasegawa & Syafruddin, 1997
Mazamanema Cameron, 1935
Mazamastrongylus Cameron, 1935
Mazonova Godfrey, 1995
Mazzia Khalil & Vogelsang, 1932
Mbaisonema Beveridge, 1997
Mbanema Spiridonov, 1992
Medalinema Baqri & Jana, 1980
Mediosulcolites Hu Houtian, 1980
Medusichnites Matthew, 1891
Megacooperia Khalil & Gibbons, 1976
Megadictyon Luo & Hu, 1999
Megagyrolithes Gaillard, 1980
Megalisma Rafinesque, 1820
Megalomermis Müller, 1931
Megalosauripus Lockley, Meyer & dos Santos, 2000
Megamphidelus Siddiqi, 1993
Megaonchulus Jairajpuri & Khan, 1982
Megapermichnus Jenny & Jenny-Deshusses, 1978
Megaplanolites Calvo, Gil & Melendez, 1987
Megasphaera Chen & Liu, 1986
Mehdinema Baqri & Jana, 1980
Melatercichnus Miller, 1991
Melicerion Porter, Meisterfeld & Knoll, 2003
Melkanicyathus
Melolonthinimermis Artyukhovskii, 1963
Membranacyathidae
Membranacyathus Rozanov, 1960
Memoriacyathus Yazmir, 1975
Memphisia Khalil, 1922
Meningonema Orihel & Esslinger, 1973
Mennericyathus Debrenne & Rozanov, 1974
Menola Schallreuter, 1981
Mentecle Travassos & Kloss, 1958
Merifontichnus Gand, Garric, Demathieu & Ellenberger, 2000
Merinthoidum Kraemer, 1855
Meristosoma Robison & Wiley, 1995
Merocriconema Raski & Pinochet, 1976
Mertensinema Sharpilo, 1976
Mesoanguina Chizhov & Subbotin, 1985
Mesocyathus Vologdin, 1977
Mesodiplogasteroides Khera, 1969
Mesodorylaimellus Jairajpuri & Ahmad, 1980
Mesonactus Fu, 1989
Mesonema Pierantoni, 1916
Mesotobrilus Tsalolikhin, 1981
Mesotylus Guiran, 1963
Metabronema Yorke & Maplestone, 1926
Metacanthonchus Wieser, 1955
Metacrolobus Vinciguerra, 1994
Metacyathidae
Metacyrnea Chabaud, 1961
Metadorylaimellus Jairajpuri & Ahmad, 1980
Metaeyathellus Debrenne & Zhuravlev, 1990
Metaleptus Machida, Ogawa & Okiyama, 1982
Metalochondina Branson & Mehl, 1941
Metangusticaecum Mozgovoi, 1950
Metapelagonema Sergeeva, 1972
Metaquimperia Karve, 1941
Metascaris Schuurmans Stekhoven, 1951
Metathelazia Skinker, 1931
Meteterakis Karve, 1930
Metheligmonella Durette-Desset, 1971
Metyacyathellus
Miassocyathus Fomin, 1963
Micatonchus Jairapuri, Tahseen & Choi, 2001
Micatuba Chamberlain, 1971
Miconchoides Jairajpuri & Khan, 1982
Micrina Laurie, 1986
Micritina Nagy, 1989
Micritivesica Sheng, 1991
Micritosphaera Scott, 1978
Microancientia Schallreuter, 1980
Microannulatum Diab, 1966
Microcephalella Strand, 1942
Microcephalus Romanovitch, 1915
Microcoryne Bengtson, 1990
Microdictyon Bengtson, Matthews & Missarzhevsky, 1986
Microdictyonidae
Microgemmula Langer, 1980
Micrognathozoa
Micronemaites Hubei Sheng Dizhi Ju Sanxia Diceng Yanjiu Zu [Hubei Province Bur. of Geol. Sanxia Stratigraphical Res. Gp], 1978
Micronematodum Castelli, 1926
Microschedia Geyer, 1994
Microspherichnus Hakes, 1976
Microspirolithus Yang & Yin, 1982
Microstrongylus Cameron, 1927
Mikhnocyathus
Mikinema Chesunov, 1978
Mikrocalyx Wetzel, 1967
Milaecyathus Debrenne & Zhuravlev, 2000
Minourella Munnecke, Servais & Vachard, 2000
Minutostrongylus Leroux, 1936
Mioaphelenchus Pierce, 1964
Miodorylaimus Andrassy, 1986
Miotroctes Nel, De Ploeg & Azar, 2004
Mirabifolliculus Yang & He, 1985
Mirachitina Eisenack, 1931
Mirandaia Travassos, 1937
Mirandaichnium Acenolaza, 1978
Mirandocyathus Belyaeva, 1974
Mirandonema Kreis, 1945
Miricyathus Vologdin, 1977
Miriella Jiang & Huang, 1986
Mirocorcillum Dumitrica, 1972
Mirzaloptera Wason & Johnson, 1977
Misonunus Petrov, 1910
Misraea Maithy & Babu, 1987
Mitchellichnus Walker, 1985
Mitosiphon Fisher, 1950
Mitrephoros Linstow, 1877
Mitrephorus Linstow, 1877
Mizunamia Ishijima & Hatai, 1973
Moaciria Teixeira de Freitas, 1956
Mobergellidae Missarzhevsky, 1989
Moennigia Travassos, 1935
Moguranema Yamaguti, 1941
Mohibiella Farooqui, 1970
Molinacuaria Wong & Lankester, 1985
Molinofilaria Vuylsteke, 1956
Molinospirura Oliveira Rodrigues, 1964
Mollusca
Molossinema Georgi, Georgi, Jiang & Frongillo, 1987
Molostrongylus Durette-Desset & Vaucher, 1996
Molybdocyathus Debrenne & Gangloff, 1990
Mongolitesta Esakova, 1996
Mongolitubulus Missarzhevsky, 1977
Mongolotheristus Tsalolikhin, 1985
Monhysterides Baylis & Daubney, 1922
Monhysteriella Kreis, 1929
Monilonema Beveridge & Johnson, 1981
Monnigofilaria Skrjabin & Shikhobalova, 1948
Monocyathidae
Monodontella Yorke & Maplestone, 1926
Monodontus Molin, 1861
Monofungites Mikulas, 1992
Monohystrella Cobb, 1918
Monospiculus Ali, 1957
Monospinites Sayutina, 1988
Monotheles de Fromentel, 1860
Monovaria Khera, 1955
Monstricyathus Vologdin, 1977
Montemonstrum Heidtke & Krätschmer, 2001
Monticulichnus Kappel, 2003
Mootwingeecyathidae
Mootwingeecyathus Kruse, 1982
Morasinema Javed, 1984
Morenchus Dhanachand, Renubala & Mohilal, 1991
Morenicyathus
Morerastrongylus Chabaud, 1973
Morganiella Travassos, 1937
Morganostrongylus Fahmy, 1956
Moshajia Siddiqi, 1982
Moyeronia Nikiforova & Rozov, 1979
Mrassocyathus
Muchattocyathus Rosanov, 1976
Mukhnocyathus Maslov, 1957
Multiaqueichnus Yang & Yin, 1982
Multicaecum Mozgovoi, 1951
Multilamella Orlowski, 1989
Multipodichnus Walter, 1983
Mulveyotus Anderson & Ebsary, 1982
Mumtazium Siddiqi, 1969
Murielus Dikmans, 1939
Murisubulura Quentin, 1970
Murrayscolex Müller & Hinz-Schallreuter, 1993
Muscochitina Paris, 1981
Myleusnema Moravec & Thatcher, 1996
Myostomellidae Riedl, 1954
Myriodocites Marcou, 1880
Myriosidrum Rafinesque, 1814
Myrowichnus G.J. Retallack, 2009
Mystheria Regali & Sarjeant, 1986
Myxozoa
Myzomimus Stiles, 1892
Nacobbodera Golden & Jensen, 1974
Nadinema Hugot, 1983
Naibiidae Shcherbakov, 2007
Naimarkcyathidae
Naimarkcyathus Wrona & Zhuravlev, 1996
Naites Geinitz, 1867
Nalivkinicyathus Osadchaja, 1983
Namaquanema Heyns & Swart, 1993
Namibinema Rashid & Heyns, 1990
Nanidorus Siddiqi, 1973
Nanjiangofolliculus Yang & He, 1985
Nankaites Katto, 1964
Nanochitina Nestor, 1994
Nanomermis Cobb, 1925
Naraoiiformes Starobogatov, 1985
Narsingiella Rao, 1978
Nasistrongylus Durette-Desset & Beveridge, 1982
Natalijaecyathus Kotelnikov, 1995
Naviculichnium Ksiazkiewicz, 1977
Necrogammarus Woodward, 1870
Nectaspida Størmer, 1959
Nectocaris Conway Morris, 1976
Nectopelta Siddiqi Tylenchida, 1986
Nellicyathus Fonin, 1964
Nellisyathus Fonin, 1964
Nemabia Siddiqi, 1995
Nematevansia Ihle, 1919
Nematochitina Tsegelnyuk, 1982
Nematoda
Nematomorpha Vejdovsky, 1886
Nematomystes Sutton, Chabaud & Durette-Desset, 1980
Nematospira Walton, 1923
Nematostrongylus Cameron, 1928
Nematoxis Drasche, 1883
Nematoxynema Skrjabin & Shikhobalova, 1951
Nematoxys Schneider, 1866
Nemavermes Schram, 1973
Nemertea
Nemertites MacLeay, 1839
Nemonchus Cobb, 1913
Nemotapis Kozur & Mostler, 1972
Nenocriconema Darekar & Khan, 1982
Neoatractis Gupta & Aggerwal, 1974
Neobakernema Ebsary, 1981
Neobasiria Javed, 1982
Neocamallanus Ali, 1957
Neocapillaria Yu Yi & Wang Guitang, 1994
Neocephalobus Steiner, 1929
Neocosmocercella Baker & Vaucher, 1983
Neocriconema Diab & Jenkins, 1965
Neocrossonema Ebsary, 1981
Neocucullanus Travassos, Artigas & Pereira, 1928
Neocyathus Vologdin, 1960
Neocylicostrongylus Arya & Johnson, 1977
Neodictyon Mikulas, 1992
Neodiplogasteroides Rühm, 1956
Neodiscolaimium Patil & Khan, 1982
Neoentomelas Hasegawa, 1989
Neofilaria Deshmukh, 1968
Neogoezia Kreis, 1937
Neoheterakis Kumar & Thienpont, 1974
Neohilgertia Navone, Suriano & Pujol, 1990
Neoichthyostrongylus Naqvi & Gupta, 1987
Neokolbicyathus Konyaeva, 1997
Neoleptus Specian, Ubelaker & Dailey, 1975
Neoloculicyathus Voronin, 1974
Neolongidorus Khan, 1987
Neomermis Linstow, 1904
Neometadorylaimus Jairajpuri & Ahmad, 1992
Neometaquimperia Agrawal, 1965
Neometastrongylus Kreis, 1944
Neoomeia Yin & Zhang, 1984
Neoparacamallanus Bilqees & Akram, 1982
Neoparaseuratum Moravec, Kohn & Fernandes, 1992
Neopharyngodon Chakravarty & Bhaduri, 1948
Neoprotozoophaga Biswas & Chakravarty, 1963
Neorhabditis Schuurmans Stekhoven, 1954
Neorhabditostomum Gibbons & Kan, 1987
Neoskolithos Kegel, 1966
Neosomatiana Anwar-ul-Islam, Farooq & Khanum, 1979
Neospinitectus Kalyankar, 1971
Neospirocerca Johnson, 1968
Neosteinernema Nguyen & Smart, 1994
Neostrongyloides Rathore & Nama, 1988
Neoxysomatoides Yamaguti, 1961
Nepalus Ahmad & Jairajpuri, 1980
Nephrooides Qian Yi, 1977
Nephrotheca Marek, 1966
Nervus Laporte, 1792
Nesomystrongylus Durette-Desset, Lethonen & Haukisalmi, 2002
Netrorhynchus Zenker, 1827
Nettorhynchus Gervais, 1846
Nettrorhynchus Dubini, 1850
Neurodictyon Li, 1992
Neurofilaria Whitlock, 1952
Nevadachitina Soufiane & Achab, 2000
Nevadatubulus Signor, Mount & Onken, 1987
Neyrapharingodon Calvente, 1948
Neyrapharyngodon Calvente, 1948
Nicanoria Freitas, Vicente & Pinto, 1970
Nicollia Baylis, 1930
Nidomicritina Nagy, 1989
Nigronchus Siddiqi, 1984
Nikolarites Vassiljeva, 1994
Nilonema Khalil, 1960
Ninella Missarzhevskij, 1981
Ningqiangella Zhang Luyi, 1986
Ningxiaichnus Yang, 1985
Nochoroicyathella Korshunov, 1983
Nochoroicyathellus Osadchaya, 1979
Nochoroicyathus Shuraleva, 1951
Nochtia Travassos & Vogelsang, 1929
Noctuidonema Remillet & Silvain, 1988
Nodituba Bi, Guo & Qian, 1996
Nododendrina Vogel, Golubic & Brett, 1987
Nordia Jairajpuri & Siddiqi, 1964
Notabilitidae
Noteodiplogaster de Villalobos, Camino & Reboredo, 1998
Nothactinolaimus Loof, 1973
Nothocriconemella Ebsary, 1981
Notholetus Ebsary, 1981
Nothotylenchoides Handoo, 1980
Notocubichnia Badve & Hare, 1980
Notonectomermis Rubtzov, 1977
Notopteroides Chakravarty & Majumdar, 1962
Nualaimus Juario, 1974
Nuchacyathus Kruse, 1982
Nullonchus Siddiqi, 1984
Numidica Barreto, 1919
Nummipera Holder, 1989
Nycteridostrongylus Baylis, 1930
Nygellolaimellu Dhanam & Shamim Jairajpuri, 1999
Nygostylus Sukul, 1973
Obainia Adamson, 1983
Obliquathecidae
Obliquus Marintsch & Finks, 1982
Oblongoolithus Mikhailov, 1996
Occipitodontus Ortlepp, 1923
Oceanicucullanus Schmidt & Kuntz, 1969
Oceanifilaria Schmidt & Kuntz, 1970
Ochetocephalus Linstow, 1907
Octoberaspis Dunlop, 2002
Octodonthoxys Quentin, Courtin & Fontecilla, 1975
Odocoileostrongylus Shultz, 1951
Odonatomermis Rubtsov, 1973
Odontogeton Allgén, 1921
Odontogriphidae
Odontorobius Skrjabin & Shikhabalova, 1951
Odontospirura Wehr, 1933
Odotula Hayasaka & Aoyana, 1975
Oekentorpia Langer, 1997
Oekentorpites Langer, 1997
Oesophagonastes Mawson, 1965
Ohbayashinema Durette-Desset, 1974
Oichnus Bromley, 1981
Oiella Hinz-Schallreuter & Schallreuter, 2000
Okapinema Ivashkin, 1960
Okapistrongylus Van den Berghe, 1937
Okulitchicyathus Zhuravleva, 1960
Oldhamia Forbes, 1848
Olgaecyathidae
Olgaecyathus Borodina, 1974
Oligaphelenchoides Poinar, 1977
Oligodiplogaster Poinar, 1977
Oligomonohystera Micoletzky, 1922
Oligonchulus Andrassy, 1976
Oligonodus Luo & Hu, 1999
Olivooides Qian Yi, 1977
Ollachitina Poumot, 1968
Onchesius Rafinesque, 1815
Onchiomermis Rubtzov, 1976
Onchocamallanus Petter, 1979
Oniscicula Schwenk, 1927
Onychia Jiang, 1982
Onychodictyon Hou Xianguang, Ramskold & Bergstrom, 1991
Onychophora
Oochitina Tsegelnyuk, 1982
Oomicritina Nagy, 1989
Oostenbrinkella Jairajpuri, 1965
Oostenbrinkia Ali, Suryawanshi & Ahmed, 1973
Operculites Gesner, 1758
Operculorhabditis Khera, 1969
Ophiodracunculus Yamaguti, 1961
Ophioichnus Bell, 2004
Ophiorhabdias Yamaguti, 1943
Opisthotylencholaimus Jairajpuri & Ahmad, 1992
Opisthotyleptus Jairajpuri & Ahmad, 1992
Opistonema Pierantoni, 1916
Oravaichnium Plicka & Uhrova, 1990
Orbiasterocyathus Repina, Khomentovskii, Zhuravleva & Rozanov, 1964
Orbichitina Achab, Asselin & Soufiane, 1993
Orbicoscinus Debrenne, 1977
Orbiculichnus Holub & Kozur, 1983
Orbicyathellus Osadchaya, 1973
Orbicyathus
Orbiparanocyathus Belyaeva, 1996
Ordochitina Achab, Asselin & Soufiane, 1993
Orienticyathus
Orientostrongylus Durette-Desset, 1971
Orihelia Chabaud & Bain, 1976
Orissiella A. Tripathi, 2004
Orloffia Drozdz, 1965
Orneoascaris Skrjabin, 1916
Ornithocoprus Buckland, 1829
Ornithoformipes Patterson & Lockley, 2004
Ornithonema Travassos, 1935
Ornithosetaria Sandground, 1933
Ornitocaecum Mozgovoi, 1951
Orochitina Tsegelnyuk, 1982
Orphreyus Siddiqi, 2000
Orthocyathus Vologdin, 1977
Orthogonum Radtke, 1991
Orthomermis Poinar, 1964
Orthonectida Giard, 1877
Orthotheca Novák, 1887
Orthothominx Freitas & Silva, 1960
Orthrozanclidae Conway Morris & Caron, 2007
Ortica Molina, 1810
Ortleppascaris Sprent, 1978
Ortleppina Schulz, 1927
Ortleppnema Petter, 1966
Ortleppstrongylus Durette-Desset, 1970
Ortoanisakis Mozgovoi, 1951
Oryctophila Van Waerebeke, 1973
Osadchiites Zhuravleva, 1997
Oscillorhaphe Seilacher, 1977
Oshimaia Sugimoto, 1934
Osleroides Orloff, Davtjan & Lubimov, 1933
Osteornis Gervais, 1844
Ostertagiana Dikov, 1963
Ostertamia Dikov, 1963
Oswaldonema Travassos, 1927
Oswaldostrongylus Lent & Freitas, 1934
Ovatiichnum Yang, 1983
Ovomermis Rubtzov, 1976
Ovuliger Chiaje, 1844
Oxisoma Condorelli-Francaviglia, 1899
Oxyascaris Travassos, 1920
Oxybelondira Ahmad & Jairajpuri, 1979
Oxysoma Schneider, 1866
Oxysomoides Walton, 1927
Oxysperura
Oxyurias Stiles, 1905
Oxyuronema Kreis, 1932
Ozysoma Condorelli-Francaviglia, 1899
Pachecocyathus Perejon Rincon, 1971
Pachiloma Rafinesque, 1820
Pachycoscinus
Pachycoseinus Debrenne, 1977
Pachydora Wieser, 1954
Pachyloma Agassiz, 1846
Paganzichnus Pazos, 2000
Paiutitubulitidae
Pakcriconemoides Shahina & Maqbool, 1993
Pakdacnitis Akram, Mujib Bilqees & Khatoon, 1997
Pakmylonchulus Khan & Saeed, 1987
Palaeoarcella Porter, Meisterfeld & Knoll, 2003
Palaeoconularia Chudinova, 1959
Palaeoconulariidae
Palaeocuniculichnites Ghare & Badve, 1977
Palaeocyphonautes Via Boada & Romero Diaz, 1978
Palaeodiscus Gaucher, 2000
Palaeohelminthopsis Mikulas, 2000
Palaeojulus Geinitz, 1873
Palaeophycus J. Hall, 1847
Paleaichnus Yang, 2000
Palenchitina Schweineberg, 1987
Paleogallus Vyalov, 1975
Paleolithophaga Chiplonkar & Ghare, 1976
Paleomina Vyalov, 1975
Paleophycus James, 1879
Paleoscopimera Katto, 1962
Palimmecopus Sarjeant & Langston, 1994
Pallachitina da Costa, 1970
Pallichnus Retallack, 1984
Pallmicritina Nagy, 1989
Palmericyathus
Panagrocephalus Andrassy, 1967
Panagrodontus Thorne, 1935
Panagrolaimoides Ivanova, 1976
Panagroteratus Andrassy, 1986
Pannomicritina Nagy, 1989
Panshitubulus Liu & Gao, 1992
Pantoioscolex Müller & Hinz-Schallreuter, 1993
Paolites Marek, 1975
Papiliocaris Jell, 1983
Papillocyathidae
Papillocyathus Rozanov, 1964
Papillosetaria Vevers, 1923
Papilloslerus Khera, 1956
Papillostrongylus Johnston & Mawson, 1939
Papulicyathus Vologdin, 1977
Parabatrachostrongylus Tantalean & Naupay, 1974
Parabonellia Onoda, 1935
Parabutlerius Ebsary, 1986
Paracameronia de Carvalho & Spiridonov, 1991
Paracanthocheilonema Vladimirov, 1959
Paracanthocheilus Kreis, 1952
Paracarinachitidae
Paracephalobus Akhtar, 1962
Parachromadora Micoletzky, 1914
Paracis Railliet & Henry, 1916
Paracooperia Travassos, 1935
Paracooperioides Boomker, Horak & de Vos, 1981
Paracoscinus Bedford & Bedford, 1936
Paracosmocera Kung & Wu, 1945
Paracriconema Ebsary, 1981
Paracruziana Cao & Lu, 1991
Paractinolaimoides Khan, Ahmad & Jairajpuri, 1994
Paracucullanellus Agrawal, 1965
Paracyrnea Gupta & Jaiswal, 1988
Paradictyodora Oliver, Buatois & Scasso, 2004
Paradidymaulichnus Hu & Wu, 1993
Paradiplogaster Stekhoven & Tennisson, 1938
Paradoxiconus Qian, Li, He & Xie, 2001
Paradoxogaster Khera, 1970
Paradoxorhabditis Khera, 1971
Paraduslia Dunlop, 2002
Paraenchodelus Ahmad & Jairajpuri, 1980
Paraereptonema Eroshenko, 1977
Paragendria Baylis, 1939
Paragordia Yang, 1992
Paragrallator Li & Zhang, 2000
Paragraphidium Freitas & Mendonca, 1960
Parahadronchus Mulvey, 1978
Parahaentzschelinia Chamberlain, 1971
Parahamipes Holub & Kozur, 1983
Parahelicorhaphe Yang, 1986
Paraheligmonella Durette-Desset, 1971
Paraheligmonelloides Fukumoto, Kamiya & Suzuki, 1980
Paraheligmosomum Asakawa & Satoh, 1987
Paraheterakis Nama & Jain, 1974
Paraheterophyllum Johnston & Mawson, 1948
Parahistiocephalus Belopolskaya, 1953
Parahorridomus Duan, Cao & Zhang, 1993
Paraicosiella Majumdar & Chakravarty, 1963
Paralabiostrongylus Smales, 1982
Paralaeuris Cuckler, 1938
Paralanicichnites Ghare & Badve, 1981
Paraleiuris Vaz & Pereira, 1929
Paralemdana Johnston & Mawson, 1940
Paraleptonchus Dhanam & Jairajpuri, 1999
Paraleptonema Wang, 1980
Paraleptus Wu, 1927
Paralibyostrongylus Ortlepp, 1939
Paralobocriconema Minagawa, 1986
Paramadochotera Esslinger, 1986
Paramalenchus Sumenkova, 1988
Paramargaritichnus Holub & Kozur, 1983
Paramermis Linstow, 1898
Paramesopsocidae
Paramicipsella Chow, 1939
Paramidostomum Freitas & Mendonça, 1950
Paramonovia Eliava, 1973
Paramonovnema Andrassy, 1968
Paramylonchulus Jairajpuri & Khan, 1982
Paranabarites Jiang, 1982
Paranacyathus
Paranematospira Sprehn, 1935
Paraochoterenella Purnomo & Bangs, 1999
Paraophidichnium Demathieu, 1977
Paraorientatractis Gibbons, Khalil & Marinkelle, 1997
Paraoxyascaris de Oliveira Rodrigues & Rodrigues, 1971
Paraoxybelondira Dhanam & Shamim Jairajpuri, 1999
Paraoxydirus Jairajpuri & Ahmad, 1979
Paraoxyuronema Artigas, 1937
Parapandorina Xue, Tang, Yu & Zhou, 1995
Parapharyngostrongylus Beveridge, 1982
Paraphilometroides Moravec & Shaharom-Harrison, 1989
Paraphysaloptera Gupta & Kazim, 1979
Paraplanolites Ding & Chen, 1984
Paraplectana Ryzhikov, 1980
Paraprocta Maplestone, 1931
Parapseudaspidodera Johnson, 1967
Paraqudsiella Siddiqi, 1981
Paraquilonia Neveu-Lemaire, 1924
Parareceptaculites Bartholomaus, Bohmecke & Lange, 1999
Pararetecyathus Yuan & Zhang, 1978
Pararhabdonema Kreis, 1945
Pararotadiscus Zhu, Zhao & Chen, 2002
Pararotifera Pierce, 1964
Pararusophycus Ksiazkiewicz, 1977
Parasaurositus Gupta & Johri, 1989
Parascalaritubus Yang & Yin, 1982
Paraseuratum Johnston & Mawson, 1940
Parasitodiplogaster Poinar, 1979
Parasomatium Anwar-ul-Islam, Farooq & Khanum, 1979
Paraspiculuris Akhtar, 1955
Paraspirura Sandground, 1936
Paraspongeliomorpha Yin, Li & He, 1993
Parastrongylus Baylis, 1928
Parasymplocostoma Schulz, 1931
Parataenidium Buckman, 2001
Parathelandros Baylis, 1930
Paratisoa Gaillard, 1972
Paratractis Gupta & Naiyer, 1989
Paratylenchoides Raski, 1973
Paraustroxyuris Mawson, 1964
Paraxiphidorus Coomans & Chaves, 1995
Paraxonolaimus Allgén, 1930
Paraxyo Travassos & Kloss, 1958
Parazhijinites Qian & Yin, 1984
Parelaphostrongylus Boev & Schultz, 1950
Pareterakis Teixeira de Freitas, 1956
Parethmophyllum Debrenne, 1987
Parhadjelia Lent & Freitas, 1939
Parhamatospiculum Skrjabin & Petrow, 1928
Parisochitina Boumendjel, 1986
Parkellus Jairapuri, Tahseen & Choi, 2001
Parlitomosa Nagaty, 1935
Parmia Gnilovskaya, 1998
Paroesophagostomum Scheidegger & Kreis, 1934
Paronai Rao & Rao, 1981
Paronchocerca Peters, 1936
Paroriverutus Carbonell & Coomans, 1982
Parostertagia Schwartz & Alicata, 1933
Parowanichnus Bown, Hasiotis, Genise, Maldonado & Brouwers, 1997
Parundichna Simon, Hagdorn, Hagdorn & Seilacher, 2003
Parveyellus Hirling, 1989
Parvoolithus Mikhailov, 1996
Parvulonoda Rigby & Hou, 1995
Parvuscyathus Fonin, 1982
Paryseria Johnston, 1938
Passalidophila Van Waerebeke, 1973
Passeristrongylus Jansen, 1985
Patanodontus de Villalobos & Camino, 1997
Pateracephalanema Mehta & Raski, 1971
Paterimitra Laurie, 1986
Pathotylenchus Eroshenko & Volkova, 1987
Patricialina Inglis, 1968
Paucipodia Chen, Zhou & Ramskold, 1995
Paulianfilaria Chabaud, Anderson & Brygoo, 1960
Pectenocyathus Repina, 1964
Pecticoma Rafinesque, 1832
Pectinospirura Wehr, 1933
Pedila Rafinesque, 1815
Pelagosphaera Mingazzini, 1905
Pelecanascaris Ali & Farooqui, 1970
Pellichitina Achab, Asselin & Soufiane, 1993
Pellipecten Siddiqi Tylenchida, 1986
Pellmicritina Nagy, 1989
Pelodytes Schneider, 1859
Pemmatodiscus Monticelli, 1896
Penjatinema Heyns & Swart, 1998
Pennatichnus Mayoral, 1988
Pennisia Bain & Chabaud, 1979
Pentagonium Snopkova & Samuel, 1982
Pentapodichnus Walter, 1983
Pentatomimermis Rubtsov, 1977
Peponotripeta Tang, 1994
Peramelistrongylus Mawson, 1960
Peregrinicyathus Zhuravleva, 1967
Pereiraia Cuocolo, 1943
Peresiana Vitiello & De Coninck, 1968
Pericephas Rafinesque, 1814
Pericyema Railliet, 1925
Peridonella
Periplaneticola Basir, 1940
Peripteratocyathus Vologdin, 1964
Peritrachelius Diesing, 1851
Permicritina Nagy, 1989
Peronilaimus Rahm, 1928
Perostrongylus Schlegel, 1934
Perspira Wieser & Hopper, 1967
Pesteria Tadros, 1966
Petalichnus Miller, 1880
Petalina Leinfelder, 1997
Petalostroma Pflug, 1973
Petauxyuris Hugot, 1985
Petiellus Durette-Desset & Chabaud, 1975
Petronema Hugot, 1983
Petrovifilaria Sonin, 1961
Petroviprocta Shakhtakhtinskaya, 1951
Petrowimeres Chertkova, 1953
Petrowospirura Matschulski, 1952
Phacatrum Luo & Hu, 1999
Phacelopus Sarjeant & Langston, 1994
Phacochoerostrongylus Schwartz, 1928
Phaenopsitylenchus Blinova & Korentchenko, 1986
Phagolignichnus Vyalov, 1975
Phalacronema Clark, 1978
Phaldonema Rathelot, 1892
Phallosoma Levinsen, 1883
Phanodermatina Allgén, 1942
Phanodermina Allgén, 1939
Phantapus Latreille, 1825
Pharetria Schrank, 1803
Pharetrolaimus Man, 1921
Pharyngosetaria Lubimov, 1937
Pharyngostrongylus Yorke & Maplestone, 1926
Phascolana Wesenberg-Lund, 1959
Phascoloides Fisher, 1950
Phascolostrongylus Canavan, 1931
Phasganichnus Yang, 1992
Phasganula Luo & Hu, 1999
Philostrongylus Wolfgang, 1951
Phiolachitina Montenari & Maass, 1996
Phlogites Luo & Hu, 1999
Phoronida Hatschek, 1888
Phragmorpha Wang, Qiang & Fan, 1994
Phreatomermis Coman, 1953
Phrixichnus Bromley & Asgaard, 1993
Phyllochites Qian & Yin, 1985
Phyllochiton Duan, 1984
Phyllocodites Gümbel, 1879
Phyllocrina Zborzewski, 1834
Phyllodocites Geinitz, 1867
Phymatocyathus Vologdin, 1977
Physalopteriata Sobolev, 1949
Physalopteroides Wu & Liu, 1940
Physis Scopoli, 1786
Physocephaloides Maplestone, 1932
Physoon Rafinesque, 1814
Phytorhabditis Lordello & Oliveira, 1963
Piamaecyathellidae
Piamaecyathellus Rozanov, 1964
Piamaecyathus Zhuravleva, 1960
Piavussunema Kohn, Gomes & Motta, 1968
Picarilaimus Sukul, 1973
Pierantonia Baylis & Daubney, 1926
Piguris Schlotthauber, 1860
Pikaeuris Aktar, 1953
Pilichnus Uchman, 1999
Pilodicoscinus Debrenne & Jiang, 1989
Pinaceocladichnus Mayoral, 1988
Pingus Hsü, 1933
Pinsdorfichnis Vialov, 1989
Pintoia Travassos, 1928
Pintonema Travassos, 1935
Pirandikus Holub & Kozur, 1983
Piratuba Lent & Freitas, 1941
Piratuboides Bain & Sulahian, 1975
Pirikia Hatai & Noda, 1975
Piscindusia Jarzembowski, 1995
Pistillachitina Taugourdeau, 1966
Pithecostrongylus Lubimov, 1930
Placerotapis Kozur & Mostler, 1972
Plachiloma Férussac, 1835
Placoconus Webster, 1956
Placozoa Grell, 1971
Planalites Walcott, 1899
Planavolites Mikulas, 1992
Planipes Gand, Demathieu & Ballestra, 1995
Planobola Schmidt, 1992
Planolites Nicholson, 1873
Planomus Rafinesque, 1815
Planula Dalyell, 1835
Platocamallanus Bilqees & Akram, 1982
Platydendrina Vogel, Golubic & Brett, 1987
Platyhelminthes
Platysolenitidae
Platysphaerites Trenkner, 1868
Platyspinites Vassiljeva, 1985
Platysubulura Quentin, 1970
Platytuba Borkar, 1985
Plectochitina Cramer, 1964
Plectostrongylus Mackerras & Sandars, 1953
Plectropterna Hitchcock, 1858
Plegmacrinites Quenstedt, 1856
Plesiodorus Siddiqi, 1976
Plesioungella Yeates, Spiridonov & Blakemore, 1998
Pleuranisis Rafinesque, 1820
Plicatolabia Mozgovoi, 1950
Plicocyathus Vologdin, 1960
Plinthokonion Landing, 1988
Plumifascicularia Schipitzyn & Sosnovskaja, 1984
Pluralicoscinus Debrenne & Lotze, 1963
Plutellonema Timm & Maggenti, 1966
Plyntheria Rafinesque, 1815
Pneumocaulus Schulz & Andreeva, 1948
Pneumonema Johnston, 1916
Podelius Rafinesque, 1815
Podocnematractis Gibbons, Khalil & Marinkelle, 1995
Podolimirus Fedonkin, 1983
Podostoma Rafinesque, 1814
Podurites Matthew, 1895
Poekilostrongylus Schmidt & Whittaker, 1975
Pogonochitina Taugourdeau, 1961
Polarichnus Narbonne, 1979
Polasmus Rafinesque, 1814
Politospiculum Skrjabin, 1925
Pollofructus Geng & Zhang, 1987
Polyactina Radtke, 1991
Polycaecum Maplestone, 1930
Polycoscinidae
Polycoscinus Bedford, 1937
Polycylindrichnus Fournier, Pemberton & Risk, 1980
Polydelphyoptera Schulz, 1927
Polyechinivesica Sheng, 1991
Polygastrophorella Schuurmans Stekhoven, 1935
Polymeres Sandberger, 1842
Polymonus Rafinesque, 1814
Polymorphotylenchus Rühm, 1956
Polyonchulus Mulvey & Jensen, 1967
Polypodichnus Ghare & Kulkarni, 1986
Polysolenia Ehrenberg, 1860
Polysphaera Lambert & Villain, 1996
Polyurida Almond, 1985
Polyvesica Sheng, 1991
Polyzosterites Goldenberg, 1875
Pontobolbos Dendy, 1898
Pontochona Mamaev, 1968
Popovastrongylus Mawson, 1977
Popradichnium Plicka, 1983
Poratites Jiang, 1980
Poraxonchium Coomans & Nair, 1975
Porcauricula Qian Yi & Bengtson, 1989
Porifera Grant, 1836
Porivallia Sheng, 1991
Porocoscinidae
Porocoscinus Debrenne, 1964
Porocyathellus Debrenne, 1977
Porocyathus Zhuravleva, 1960
Poronema Heyns, 1963
Poronemella Siddiqi, 1969
Porosmilia Umbgrove, 1925
Porostoma Fromentel, 1860
Porternema Suryawanshi, 1972
Pospelovicyathus Konyaeva, 1997
Postamphidelus Siddiqi, 1993
Posterovulva Van Waerebeke, 1970
Potamiphus Rafinesque, 1818
Potamoceroides Munier-Chalmas, 1901
Poteriochitina Legault, 1973
Potiria Borrello, 1967
Potorostrongylus Johnston & Mawson, 1939
Potoroxyuris Mawson, 1964
Praceichnium Novak, 1984
Praecambridium Glaessner & Wade, 1966
Praefungia Debrenne, 1974
Praeputirhabditis Khera, 1969
Pragichnus Chlupac, 1987
Pravitripeta Tang, 1994
Presbyorniformipes Yang, Lockley, Greben, Erickson & Lim, 1995
Prestwoodia Anderson, 1978
Pretbmophyllum Debrenne, 1974
Preterakis Teixeira de Freitas, 1956
Prethmophyllum Debrenne, 1974
Pretiosocyathellus Osadchaya, 1979
Pretiosocyathus Rozanov, 1966
Priapulida
Pridolichnus Mikulas, Cap & Horny, 2003
Primasubulura Inglis, 1958
Prionoderma Rudolphi, 1808
Prionostemma Gendre, 1921
Prionostoma Tilesius, 1812
Prismocyathus Fonin, 1960
Pristioites Luo & Hu, 1999
Probascidea Renier, 1807
Problematicum Wiman, 1903
Proboscidea Bruguière, 1791
Proboscideus Rafinesque, 1815
Probostrongylus Sarwar, 1956
Procamallanides Khera, 1956
Procapillaria Moravec, 1987
Proceramonema Tchesunov & Miljutina, 2002
Proctobium Travassos, 1918
Procyathellus
Procyonostrongylus Anderson, Prestwood & Strelive, 1979
Prodolichorhynchus Jairajpuri, 1985
Prodomorganus Gagarin, 1993
Prodorylaimellus Jairajpuri & Ahmad, 1980
Proencaia Gomes & Pereira, 1970
Profilarinema Durette-Desset & Beveridge, 1981
Proleptonchoides Ferris, Goseco & Kumar, 1979
Promumtazium Siddiqi, 1982
Propharyngodon Biswas & Chakravarty, 1963
Propriolynthus Okuneva, 1967
Prorotodactylus Ptaszynski, 2000
Proshecosacter Gervais & Beneden, 1859
Prosthecosacter Diesing, 1851
Prosungulonema Roitman, 1963
Protenema Petter & Planelles, 1986
Protenterobius Inglis, 1961
Proteracrum Railliet & Henry, 1913
Prothelmins Linstow, 1888
Protoconites Chen, Xiao & Yuan, 1994
Protofilaria Chandler, 1929
Protolagena Zhang & Li, 1991
Protomelission Brock & Cooper, 1993
Protopalaeodictyon Ksiazkiewicz, 1970
Protopaleodictyon Ksiazkiewicz, 1970
Protostrongyloides Baudet & Verwey, 1951
Protozoophaga Travassos, 1923
Protrellatus Farooqui, 1970
Protrelleta Chitwood, 1932
Protrelloides Chitwood, 1932
Protylencholaimus Jairajpuri & Ahmad, 1992
Proxyuronema Quentin, 1975
Psammichnites Torell, 1870
Psammoscolex Klemm, 1873
Pseudaplectana Yamaguti, 1961
Pseudaproctoides Sonin, 1961
Pseudaspiculuris Akhtar, 1955
Pseudaspidodera Baylis & Daubney, 1922
Pseudaspidoderina Teixeira de Freitas, 1956
Pseudaspidoderoides Teixeira de Freitas, 1956
Pseudaspidorella Ali & Deshmukh, 1969
Pseudatractis Yamaguti, 1961
Pseudceobphalobus Joshi, 1972
Pseudoalaeuris Walton, 1942
Pseudoaviculariella Gupta & Kazim, 1979
Pseudobothrioplana Lardeux, 2004
Pseudocapillaroides Moravec & Cosgrove, 1982
Pseudocephalobus Joshi, 1972
Pseudoclathrochitina Cramer, 1967
Pseudocruzia Wolfgang, 1953
Pseudocucullanus Kalyankar, 1971
Pseudocucurbita Borza & Samuel, 1978
Pseudocyrtosomum Gupta & Johri, 1988
Pseudocystidicola Layman, 1933
Pseudodegeletticyathellus Osadchaya, 1979
Pseudodelphis Adamson & Roth, 1990
Pseudodesmochitina Paris, 1981
Pseudodesmograpton Macsotay, 1967
Pseudodiomedenema Gupta & Johri, 1989
Pseudofilaria Sandground, 1936
Pseudogaigeria Bambroo, 1971
Pseudogoezia Mozgovoi, 1951
Pseudoheligmosomum Travassos, 1937
Pseudoheterakis Travassos, 1917
Pseudolitomosa Yamaguti, 1941
Pseudometabronema Bogdanova, 1963
Pseudomicrolaimus Sergeeva, 1976
Pseudooides Qian Yi, 1977
Pseudophilometroides Parukhin, 1966
Pseudorhabdochona Liu & Wu, 1941
Pseudorictularia Dollfus & Desportes, 1945
Pseudosalebra Baryshnikov, 1982
Pseudosclerostomum Quiel, 1919
Pseudostenurus Yamaguti, 1951
Pseudostertagia Orloff, 1933
Pseudostrongyloides Kreis, 1940
Pseudostrongyluris Guerrero, 1971
Pseudostrongylus Cameron, 1927
Pseudosynaptichnium Gand, Demathieu & Ballestra, 1995
Pseudosyringocnema
Pseudotennericyathellus Osadchaya, 1979
Pseudothamugadia López-Neyra, 1956
Pseudothelandros Read, Amrein & Walton, 1952
Pseudotriceratonema Belogurov & Fadeeva, 1985
Pseudotylencholaimus Jairajpuri & Ahmad, 1992
Pseudoxyascaris Uchida & Itagaki, 1979
Psilocephala Rao, 1958
Psilonichnus Fürsich, 1981
Psyllomermis Rubtsov, 1981
Pterepia Rafinesque, 1815
Pteridichnites Clarke & Swartz, 1913
Pteridiniidae
Pteridiscaphichnos Labandeira & Phillips, 2002
Pteriditorichnos Labandeira & Phillips, 2002
Pteridopharynx Lane, 1921
Pterigotheca
Pterocephalus Linstow, 1899
Pterochitina Eisenack, 1955
Pterocyathus Yankauskas, 1965
Pteromus Wang Bing, 1994
Pteronemella Rao, 1958
Pteroxyascaris Teixeira de Freitas, 1958
Pterygifer Linstow, 1907
Ptilichnus Hitchcock, 1858
Ptretiosocyathus
Ptyariopus Sarjeant & Langston, 1994
Ptychocephalus Diesing, 1861
Pubericyathus Vologdin, 1964
Pucksia Sollas, 1895
Pukuia Leroux, 1940
Pulchrascaris Vicente & dos Santos, 1972
Pulchrocephala Travassos, 1925
Pulchrostrongylus Travassos, 1935
Pulicimermis Rubtzov, 1981
Pulmonema Chen, 1935
Pulmostrongyles Boev, 1984
Pulmostrongylus Hsü, 1935
Pumilibaxa Zheng, 1980
Punchaulus De Ley & Coomans, 1996
Punctatumvestigium Butts, 1891
Punctichnium Walter, 1983
Punctocamallanus Moravec & Scholz, 1991
Punctorhaphe Seilacher, 1977
Punctumichnium Plicka, 1987
Pungentoides Altherr, 1950
Pupiformilites Hu Houtian, 1981
Puratanichnus Mathur & Chhatri, 1987
Pustulacyathellus Debrenne & Gangloff, 1987
Pustulichnus Ekdale & Picard, 1985
Pustulicyathus Vologdin, 1977
Putapacyathidae
Putapacyathus Bedford & Bedford, 1936
Pycnoidocoscinidae
Pycnoidocoscinus Bedford & Bedford, 1936
Pygarginema Lyubimov, 1953
Pygecantha Hunt, 1997
Pygospioides Hantzschel & Reineck, 1968
Pyrgites Yue, 1984
Pyxidocyathidae
Pyxidocyathus Vologdin, 1964
Qintheca Li Yong & Ding, 1996
Qipanshanichnus Luo & Tao, 1994
Quadratitubus Xue, Tang & Yu, 1992
Quadriplotriaena Wehr, 1939
Quadrispinichna Braddy & Briggs, 2002
Quadrochites Qian Yi, Chen & Chen, 1979
Quasiamidostomum Lomakin, 1991
Quasimodaspis Waggoner, 2003
Quasistrongylus Maplestone, 1932
Quasithelazia Maplestone, 1932
Qudsianema Jairajpuri, 1965
Quebecichnus Hoffman, 1972
Quentinema Hugot, 1985
Quentinstrongylus Durette-Desset, 1969
Quentius Chabaud & Bain, 1981
Quilonia Lane, 1914
Quimperia Gendre, 1926
Rabbium Chitwood, 1960
Rabdichnites Dawson, 1873
Radhostium Plicka & Riha, 1989
Radiaxialia Pjanovskaya, 1985
Radibicupellus Wang, 1990
Radicicyathus
Radiichnus Karaszewski, 1973
Radiituba Badve & Ghare, 1978
Radimonis Kozur & Mostler, 1972
Radiomura Senowbari-Daryan & Schafer, 1979
Radiphinema Cohn & Sher, 1972
Rafiqius Khan & Hussain, 1997
Ragenema Slimane, Chabaud & Durette-Desset, 1996
Raillietakis Teixeira de Freitas, 1956
Raillietascaris Sprent, 1985
Ramidictyon Seilacher, 1977
Ramifer Yankauskas, 1965
Ramochitina Sommer & van Boekel, 1964
Ramodendrina Vogel, Golubic & Brett, 1987
Ramuscyathus Fonin, 1982
Rangeidae
Ranjhinema Rasheed, 1963
Ransomus Hall, 1916
Raonema Kloss, 1966
Raritobrilus Tsalolikhin, 1981
Rarocyathus Vologdin & Yankauskas, 1968
Rarocyathus Osadchaya, 1979
Raropectinus Debrenne & Rozanov, 1983
Rasetticyathus Debrenne, 1971
Rashidanema Siddiqi, 1983
Rasnitsynaphididae Homan & Wegierek, 2011
Rattostrongylus Shultz, 1951
Rattustrongylus Ow Yang
Rauschia Durette-Desset, 1979
Rauschivingylus Kontrimavichus & Delyamure, 1985
Rauschoxyuris Quentin, 1975
Rauschtineria Hugot, 1980
Receptaculitidae Eichwald, 1860
Redicicyathus Vologdin, 1964
Reesimermis Tsai & Grundmann, 1969
Rejkovicichnus Mikulas, Kordule & Szabad, 1996
Remulichnus Fürsich, Kennedy & Palmer, 1981
Renichnus Mayoral, 1987
Resegia Missarzhevskij, 1981
Retecoscinus Zhuravleva, 1960
Retetumulus Debrenne, 1977
Reticulina Radtke, 1991
Retilamina Debrenne & James, 1981
Retillamina
Rewardocyathus Rozanov, 1973
Rhabdaria Billings, 1865
Rhabdibicauda Sultan, Chhabra & Kaul, 1985
Rhabditostomum Chabaud & Krishmasamy, 1976
Rhabdochites He, 1984
Rhabdochitina Eisenack, 1931
Rhabdochoinoides Rahemo & Kasim, 1979
Rhabdochonoides Janiszewska, 1955
Rhabdocoprolithus Bischoff, 1990
Rhabdoichnum Yang, 1983
Rhabdolynthus Zhuravleva, 1960
Rhabdonchus Cobb, 1933
Rhabdonema Leuckart, 1879
Rhabdoneura Dollfus, 1912
Rhabdotylenchus Xie, Feng, Li & Yin, 1994
Rhagastoma Tilesius, 1812
Rhinocerotonema Jiang, Yin & Kung, 1986
Rhinoplostoma Allgén, 1929
Rhipitrus Luo & Hu, 1999
Rhizochitina Tsegelnyuk, 1982
Rhizocorallites Müller, 1955
Rhizoichnus d'Alessandro & Iannone, 1984
Rhodocalix Trenkner, 1868
Rhodonema Andrassy, 1983
Rhombocorniculum Walliser, 1958
Rhomboscolex Müller & Hinz-Schallreuter, 1993
Rhombozoa van Beneden, 1876
Rhopalia Radtke, 1991
Rhynchomermis Rubtsov, 1977
Rhynimonstrum Anderson & Trewin, 2003
Rhysophycus Schimper, 1879
Rhyssocolpus Andrassy, 1971
Rhytis Mayer, 1839
Richtersiella Kreis, 1929
Rictularina Johnston & Mawson, 1941
Rictularioides Hall, 1916
Rigidocaulis Senowbari-Daryan & Flugel, 1993
Rimotabulocyathus Yarosheviech, 1990
Ringifungia
Rituichnus Yang, 1986
Robertiolynthus Zhuravlev, 1987
Robertocyathidae
Robertocyathus
Robledoichnus Kozur & Lemone, 1995
Robustocyathellus
Robustocyathus Zhuravleva, 1960
Rodentogamus Sadovskaya, 1950
Rodentoxyuris Quentin & Tenora, 1975
Roderosignus Michalik, 1977
Rodfaecis Noda & Arakawa, 1994
Roepichnus Doyle, Wood & George, 2000
Rondonema Artigas, 1926
Rorschachichnus Gregory, 1991
Rosella Vassiljeva, 1988
Rosellichnus Genise & Bown, 1996
Rossocyathella Zhuravleva, 1960
Rotifera Cuvier, 1817
Rotterodichnium Walter, 1983
Rotundiphinema Cohn & Sher, 1972
Rotundocyathus Vologdin, 1960
Rotundus Ahmad & Jairajpuri, 1980
Rotundusichnium Plicka, 1989
Roveaphelenchus Nickle, 1970
Rowanpectinus Gravestock, 1984
Rozanites Sinitsa, 1998
Rozanovicoscinus
Rozanovicyathidae
Rozanovicyathus
Rudanulidae
Rudanulus
Rudicyathus Fonin, 1983
Rudolphia Sarwar, 1959
Ruehmaphelenchus Goodey, 1963
Rugicirichnus Bi, Guo & Qian, 1996
Rugoinfractus Paly, 1974
Rugonema Beveridge, 1999
Rugostrongylus Beveridge, 1982
Rukhinella Borovko, 1989
Rumai Travassos, 1960
Rumenfilaria Lankester & Snider, 1982
Rusgunioides Williams, 1929
Rushtonites Hinz, 1987
Rusophycus Hall, 1852
Russocyathus Zhuraleva, 1955
Rutgersella Johnson & Fox, 1968
Rutichnus d'Alessandro, Bromley & Stemmerik, 1987
Ruyangichnus Yang & Zhou, 1995
Ryjikovascaris Mozgovoi, 1950
Rytidolepis Pander, 1856
Ryzhikovistoma Ali, 1970
Saarinidae
Sabanema Ow Yang, Durette, Desset & Ohbayashi, 1983
Sabelliditidae
Sabulopsocidae
Saccomorpha Radtke, 1991
Sachitidae Meshkova, 1969
Sacrimarinema Shoshin, 2001
Saerichnites Billings, 1866
Sagacyathus Kruse, 1982
Sagenachitina Jenkins, 1970
Sagminaria
Saharochitina Paris & Grahn, 1999
Sahascolex Ivantsov & Wrona, 2004
Sajanocyathidae
Sajanocyathus Vologdin, 1945
Sajanolynthidae
Sajanolynthus
Sakhacyathidae
Sakhacyathus Debrenne & Zhuravlev, 1990
Salairocyathidae
Salairocyathus Vologdin, 1940
Salamia Sarwar, 1959
Salanacus Grigorieva, 1982
Salanycyathus Fonin, 1982
Salebra Bogush, 1976
Salebrichnus Bi, Guo & Qian, 1996
Salesia Travassos & Kloss, 1958
Salinella Frenzel, 1891
Salobrella Freitas, 1941
Salopicyathus Vologdin, 1962
Salopochitina Swire, 1990
Salterellidae Walcott, 1886
Salvelinema Trofimenko, 1962
Samsanoffoclavus Landing, 1991
Samsonoffoclavus
Samtlebenella Munnecke, Servais & Vachard, 2000
Sanarkocyathidae
Sanarkocyathus Zhuravleva, 1963
Sanarkophyllum Debrenne & Kruse, 1986
Sanctum Erickson & Bouchard, 2003
Sandaokania Luo & Hu, 1999
Sandnema Chabaud & Bain, 1976
Sanguinofilaria Yamaguti, 1935
Santafea Massey, 1963
Sanxiacyathus Yuan & Zhang, 1977
Sanyohelminthes Katto, 1962
Sarjeantipes McCrea, Pemberton & Currie, 2004
Saronichnus Pervesler & Zuschin, 2004
Sarwaria Drozdz, 1965
Sauricola Chapin, 1924
Sauronema Mozgovoi, 1951
Saurositus MacFie, 1924
Scalaridomus Palmer, 1978
Scalarituba Weller, 1899
Scalichnus Hanken, Bromley & Thomsen, 2001
Scalpenchus Siddiqi, 1995
Scaphichnium Bown & Kraus, 1983
Scarabanema Christie, 1931
Schadius Lichtenfels, 1980
Schaubcylindrichnus Frey & Howard, 1981
Schidertycyathellus Konjuschkov, 1967
Schidertycyathidae
Schidertycyathus Krasnopeeva, 1965
Schistogendra Chabaud & Rousselot, 1956
Schistoscolex Müller & Hinz-Schallreuter, 1993
Schizobucca Schuurmans Stekhoven, 1951
Schizocheilonema Diesing, 1861
Schneideria Travassos, 1926
Scholpaniella Sergeeva, 1973
Schrankia Travassos, 1925
Schrankiana Strand, 1942
Schrankiella Teixeira de Freitas, 1959
Schranknema Travassos, 1949
Schultzitrichonema Ershov, 1943
Schulzia Travassos, 1937
Schulzinema Krastin, 1937
Schumnyicyathidae
Schumnyicyathus
Schwartziella Leroux, 1936
Schwenckiana Kloss, 1966
Schwenkiella Basir, 1956
Schyromorphipus Sarjeant & Langston, 1994
Scirtimermis Kaiser & Klausnitzer, 2001
Sciuricola Durette-Desset, 1983
Scleralaimus Siddiqi, 1993
Scleroactinolaimus Ahmad, Khan & Ahmad, 1992
Sclerochitina Tsegelnyuk, 1982
Sclerocyathus Vologdin, 1960
Sclerolabia Carbonell & Coomans, 1985
Sclerolaimus Jairajpuri & Ahmad, 1992
Sclerothricum Nordmann, 1840
Sclerotrichum Rudolphi, 1819
Scolecia Radtke, 1991
Scolecolithus Roemer, 1848
Scolicia Quatrefages, 1849
Scolites Salter, 1857
Scolithas Billings, 1862
Scolixedion Renier, 1804
Scoponodus Jiang, 1982
Scoyena White, 1929
Scutellonemoides Eroshenko, 1984
Scyphocyathus Vologdin, 1977
Secundumichnus Walter, 1983
Sedilichnus Muller, 1977
Sekwia Hofmann, 1981
Sekwicyathus
Seleneella Rahm, 1932
Selenocara Bjerring, 1997
Selenoplax Cherns, 1981
Sellaulichnus Jiang, 1982
Semenola Schallreuter, 1981
Sepiaria Rafinesque, 1831
Sericyathus Voronin, 1988
Seriespinula Mehta & Raski, 1971
Serligocyathus Vologdin, 1959
Serofilaria Wu & Yun, 1979
Serpentichnoides Schweigert, 1998
Serpentichnus Braddy, Morrissey & Yates, 2003
Serradacnitis Lane, 1916
Serratocyathus Vologdin, 1960
Serticeps Railliet, 1916
Servichnus Holub & Kozur, 1983
Seshadriella Darekar & Khan, 1981
Setarospiculum Mirza & Basir, 1939
Setoglaris Azar & Nel, 2004
Setoria Viborg, 1795
Setostephanolaimus Tchesunov, 1994
Seuratinema Johnston & Mawson, 1941
Seuratoxyuris Hugot, 1988
Seuratrella Steiner, 1926
Seurechina Chabaud, Seureau, Beveridge, Bain & Durette-Desset, 1980
Severianoia Schwenck, 1926
Sexangulatus Pelman, Ermak, Fedorov, Luchinina, Zhuravleva, Repina, Bondarev & Borodaevskaya, 1990
Shaanxilithes Xing, Yue & Zhang, 1984
Shalemichnus Kozur & Lemone, 1995
Shamaoichnus Yang, 1984
Shanwangichnus Yang, 1996
Sharpichnium Walter, 1984
Shattuckius Sandground, 1938
Shergoldiscolex Müller & Hinz-Schallreuter, 1993
Sherodera Wouts, 1973
Shetlandia Wrona, 2004
Shingeinella Esakova, 1996
Shipaitubulus Chen, Chen & Qian, 1981
Shiveligocyathidae
Shiveligocyathus Missarzhevsky, 1961
Shorttia Singh & Ratnamala, 1977
Sibirecyathus
Sicaguttur Siddiqi, 1970
Sicyophorus Luo & Hu, 1999
Siddiqia Khan, Chawla & Saha, 1978
Siddiqius Andrassy, 1976
Sideritichnium Vochten, Geys & Bauten, 1976
Siderocyathus Debrenne & Gangloff, 1990
Sidichnus Kappel, 2003
Sidneyiformes Starobogatov, 1985
Sigmocoscinidae
Sigmocoscinus Bedford & Bedford, 1936
Sigmocyathidae
Sigmofungia
Silenchus Andrassy, 2001
Silimorpha Sedlak, 1977
Silvallis Ahmad & Jairajpuri, 1986
Simplexonema Kreis, 1952
Simulimermis Cafurov, Bekturganov & Gubaidulin, 1991
Sindellus Siddiqi, 1983
Singhfilaria Rasheed, 1960
Singhiella Rao, 1958
Singhnema Ali, 1969
Sinicaspirura Skrjabin & Sobolev, 1963
Sinoampulla Duan & Cao, 1989
Sinocapillaria Moravec & Spratt, 1998
Sinojuraphididae Huang & Nel, 2008
Sinophycos Mikulas, 1998
Sinoquadraticus Li, Zhang, Guo, Ding, Han & Shu, 2003
Sinosabellidites Zheng, 1980
Sinosachites He, 1980
Sinostega Zhu & Ahlberg, 2002
Sinostrongylus Hsuing & Chao, 1949
Sintanichnus Yang, 1984
Sinusichnus de Gibert, 1996
Sipherculus Rafinesque, 1815
Siphogonuchites Qian Yi, 1977
Siphogonuchitidae
Siphonacis Chesselet, 1992
Siphoneudea Fromentel, 1860
Siphonichnus Stanistreet, le Blanc Smith & Cadle, 1980
Siphonochitina Jenkins, 1967
Sipuncula
Sipunculoporus Jourdain, 1867
Sissophyllus Travassos, 1913
Sissospina Missarjevsky, 1989
Sjobergia Sarwar, 1956
Skeemella Briggs, Lieberman, Halgedahl & Jarrard, 2005
Skibbenema van Reenen & Heyns, 1986
Skinnera Wade, 1969
Skladnikia Ricci, 1939
Skolithus Hall, 1847
Skrjabinagia Kassimov, 1942
Skrjabinisakis Mozgovoi, 1951
Skrjabinispirura Barus, 1963
Skrjabinitectus Majumdar & Banerjee, 1966
Skrjabinocercella Gushanskaya, 1953
Skrjabinocerina Matschulski, 1952
Skrjabinochona Guschanskaja, 1931
Skrjabinofilaria Travassos, 1925
Skrjabinomermis Polozhentzev, 1952
Skrjabinostrongylus Boev, 1950
Skrjabinura Gnedina, 1933
Skryabinocerca Shikhobalova, 1930
Smetaleksenema Schmidt & Kuntz, 1972
Smirnovia Schulz & Andreeva, 1950
Smirnoviella Yamaguti, 1961
Snogmusongichnus Yang & Song, 1985
Soanicyathidae
Soanicyathus Rozanov, 1964
Soaresnema Travassos & Kloss, 1958
Sokolovichnites Gureev, 1983
Solafilaria Chabaud, Anderson & Brygoo, 1960
Solanichnium Plicka & Nemcova, 1991
Soldadotubulus Gaucher & Sprechmann, 1999
Soleitripeta Tang, 1994
Solenochitina Tsegelnyuk, 1982
Solenonema Diesing, 1861
Solenotia Qian & Yin, 1985
Somarites Rafinesque, 1831
Sommerochitina da Costa Cruz & Quadros, 1985
Somphocyathus Taylor, 1910
Sonella Missarzhevskiy & Grigoryeva, 1981
Soninella López Caballero & Jiminez Millan, 1979
Sonsinia Baylis & Daubney, 1922
Sparsispongia d'Orbigny, 1849
Spathachitina da Costa, 1970
Spatiocephalus Patil & Khan, 1983
Spectatus Travassos, 1923
Speiroptera Fayrer, 1879
Speroptera Aitken, 1866
Sphacelura Gervais, 1842
Sphaerichnus Fürsich, 1998
Sphaerina Riding & Soja, 1993
Sphaerochitina Eisenack, 1955
Sphaerocyathus Vologdin, 1962
Sphaerulariopsis Wachek, 1955
Sphairionia Nguyen, 1989
Spherurus Rafinesque, 1815
Sphinctocyathus Zhuravleva, 1962
Spicodiscus Bekker, 1990
Spiculaxonchium Ahmad & Jairajpuri, 1982
Spiculimermis Artyukhovskii, 1963
Spinachitina Schallreuter, 1963
Spinicyathus Vologdin, 1977
Spinifer Linstow, 1901
Spininematoides Anand & Rao, 1985
Spinodiplotriaena Kalyankar & Palladwar, 1989
Spinosocyathus Zhuravleva, 1962
Spinostrongylus Travassos, 1935
Spinoxyuris Petter, 1994
Spinulithecidae
Spiralatus Chabaud, Brygoo & Durette, 1963
Spiralella Esakova, 1996
Spiralites Wincierz, 1973
Spiranopora Plusquellec & Gourvennec, 2000
Spirellus Jiang, 1982
Spirichnus Fürsich, Palmer & Goodyear, 1994
Spirillicyathella
Spirobakerus Chabaud & Bain, 1981
Spirocaudata Sharma, 1971
Spirocercella Thwaite, 1928
Spirocircus Mikulas & Pek, 1994
Spirocosmorhaphe Seilacher, 1989
Spiroctetor Skorikov, 1909
Spirofilaria Yamaguti, 1935
Spiroichnus Mathur, 1983
Spirophera Müller, 1870
Spirophilometra Paruchin, 1971
Spiroptera Rudolphi, 1819
Spiropterina Beneden, 1858
Spiropteru Rudolphi, 1819
Spiropterus Blainville, 1820
Spiroptina Linstow, 1890
Spiroscolex Torell, 1869
Spirostrongylus Yorke & Maplestone, 1926
Spirotubus Langer, 1979
Spirotylenchus Lordella & Cesnik, 1958
Spirozoites Raspail, 1829
Spiruracerca Erickson, 1938
Splendidofilarioides Freitas & Ibáñez, 1968
Sporonchuloides Mohandas & Prabhoo, 1982
Sprattellus Durette-Desset & Cassone, 1981
Sprattia Chabaud & Bain, 1976
Sprentascaris Petter & Cassone, 1984
Sprentia Clark, 1978
Sprigginidae
Spumisalebra Bogush & Brenkl, 1982
Spygoria Salak & Lescinsky, 1999
Squamacula Hou & Bergstrom, 1997
Squamanema Van Thiel, 1925
Squamastrongylus Travassos, 1937
Squamella Vologdin, 1977
Squamodictyon Vialov & Golev, 1960
Squamosocyathus Zhuravleva, 1962
Stapicyathus
Statanulocyathus Debrenne, 1975
Stefania Grigorieva, 1982
Stegella Thorne, 1937
Stegonema Travassos, 1954
Stegopodus Lockley & Hunt, 1998
Steigerwaldichnium Kuhn, 1937
Steineriella Allgén, 1932
Steinichnus Bromley & Asgaard, 1979
Steinsfjordichnus Whitaker, 1980
Stellabronema Gushanskaya, 1937
Stellaria Vassiljeva, 1985
Stellascolites Etheridge, 1876
Stellatichnus Nielsen & Nielsen, 2001
Stellavelum Miller & Mason, 2000
Stellichnus Mayoral, 1987
Stellispinella Vasileva & Sayutina, 1993
Stelmioides Antonucci, 1929
Stelmius Dujardin, 1844
Steneudea
Steneyochitina Zaslavskaya, 1980
Stenocoelia Fromentel, 1861
Stenodes Dujardin, 1844
Stenothecopsis Cobbold, 1935
Stenroides Gerichter, 1951
Stephanicyathus
Stephanochitina Grignani & Mantovani, 1964
Stephenieyathus Zhuravlev, 1987
Stercoralis Tanaka, 1910
Stevocyathus Debrenne, 1989
Stewartia Rao, 1989
Stictoconus Qian Yi & Bengtson, 1989
Stigoma Rafinesque, 1832
Stillicidocyathus Ting, 1937
Stipanicichnus Casamiquela, 1975
Stoibostrombidae Conway Morris & Bengston, 1990
Stomachida Pereboom, 1780
Stopractinca Khan, Ahmad & Jairajpuri, 1994
Storeacolumnella Johnson, Mu & Rong, 1998
Stratipes Hitchcock, 1858
Streblorhynchus Fischer, 1808
Strechoritina Kozur & Mostler, 1972
Strephenterus Norman, 1861
Streptichnus Jensen & Runnegar, 2005
Streptocoprolithus Bischoff, 1990
Streptogaster Cobb, 1898
Streptosomum Gilson, 1898
Streptostoma Leidy, 1849
Streptostomum Leidy, 1853
Strianema Eberhard, Orihel & Campo-Aasen, 1993
Striatocyathus Vologdin & Yankauskas, 1968
Striatolagenochitina Schallreuter, 1981
Striatolites Singh & Dayal, 1979
Strictocorniculidae
Strobilepis Hall & Clarke, 1888
Strophadea Rafinesque, 1815
Strophesia Rafinesque, 1820
Strophichnus Fürsich, Kennedy & Palmer, 1981
Strumariichnus Yang, 1992
Struthiofilaria Noda & Nagata, 1976
Stunkardionema Arnold, 1941
Subiculicyathus Vologdin, 1977
Subtilocyathus Vologdin, 1960
Subtumulocyathellus Osadchaya, 1979
Sugaites Qian & Xiao, 1985
Suifilaria Ortlepp, 1937
Sukharikhina Sipin, 1999
Sukhonopus Gubin & Bulanov, 2003
Sulculites Vyalov & Nesov, 1974
Suncinema Durette-Desset, 1974
Sunicyathus Vologdin, 1964
Sunnaginia Missarzhevskii, 1969
Sunnaginidae
Supinella Kraft & Kraft, 1992
Sustergichnus Chamberlain, 1971
Sutarostrongylus Beveridge & Durette-Desset, 1986
Svalbardichnus Wisshak, Volohonsky, Seilacher & Freiwald, 2004
Svetlanocyathus Missarzhevsky & Rozanov, 1962
Sycingocnema Broili, 1915
Sylviacoscinidae
Sylviacoscinus
Symplecta Carus, 1863
Syncheilaxonchium Coomans & Nair, 1975
Synnigia Sosnovskaya, 1986
Synodontisia Petter, Vassiliades & Troncy, 1972
Synplecta Leidy, 1851
Synthetokaulus Fiebiger, 1912
Synthetonema Kreis, 1952
Syphaciuris Skrjabin & Shikhobalova, 1951
Sypharista Quentin, 1971
Syringocnemidae
Syringocoscinus Vologdin & Yazmir, 1967
Syringocyathellus Kashina, 1979
Syringothalamus Debrenne, Gangloff & Zhuravlev, 1990
Syringsella Krasnopeeva, 1961
Syro Orton Williams, 1985
Systremmatocoprolithus Bischoff, 1994
Szecyathus Vologdin, 1957
Tabasosphaera Senowbari-Daryan, 2004
Tabellaecyathus Fonin, 1963
Tabellarcyathidae
Tabulacyathellus
Tabulacyathus Vologdin, 1932
Tabulocyathellus Missarzhevski, 1964
Tachymacrus Fu, 1989
Tachynema Durette-Desset & Cassone, 1983
Tacuruichnus Genise, 1997
Taeniaecyathellus Zhuravleva, 1960
Taenidium O. Heer, 1877
Taenioichnus Yang, 1985
Taguella Benham, 1948
Talassema Burmeister, 1837
Taliella Azmi, 1998
Talitrichnus Brustur & Alexandrescu, 1993
Talpicola Basir, 1942
Tamga Ivantsov, 2007
Tanchocyathus Vologdin, 1964
Tandilinia Borrello, 1967
Tannuolacyathus Vologdin, 1957
Tannuolaiidae
Tannuolinidae
Tanuchitina
Taphozoia Ali & Lovekar, 1967
Taphrhelminthoida Ksiazkiewicz, 1977
Taphrhelminthoides Weber & Braddy, 2004
Tapia Belogurov & Fadeeva, 1985
Tapironema Durette-Desset, Chabaud & Sutton, 1997
Taprobanus Loos, 1949
Tardigrada
Tarichnus Holub & Kozur, 1983
Tarjania Brzeski & Szczygiel, 1961
Tarsichnus Walter, 1983
Tarsubulura Inglis, 1958
Taslerlella Holub & Kozur, 1983
Tasmanadia Chapman, 1929
Tasmanema Durette-Desset & Cassone, 1983
Tatijanaecyathidae
Tatijanaecyathus Korshunov, 1976
Tawila Khalil, 1932
Taxichnites Stepanek & Geyer, 1989
Taxisus Rafinesque, 1814
Taylorcyathus
Taylorfungia Perejon, 1989
Tayshira Esakova, 1996
Tchojacyathidae
Tchojacyathus Rozanov, 1960
Tchuranithecidae
Tecticyathus Vologdin, 1977
Tectonchus Tzalolikhin, 1974
Tegerocyathella Konyushkov, 1967
Tegerocyathidae
Tegerocyathus Krasnopeeva, 1955
Tegminicyathus Vologdin, 1977
Tegminites Duan & Xiao, 1992
Tejeraia Diaz-Ungria, 1964
Tektonargus Hasiotis, Kirkland, Windscheffel & Safris, 1998
Teleomermis Johnson & Bowen, 1990
Telichnus Holub & Kozur, 1983
Telomalenchus Siddiqi, 2000
Telorhabditis Osche, 1952
Telsonichnus Schweigert, 1998
Tendinema Siddiqi, 1995
Tennericyathus
Tenorastrongylus Durette-Desset, 1971
Tenrecola Durette-Desset & Chabaud, 1981
Tensfeldia Hinz-Schallreuter, 1996
Tentacularia Zeder, 1800
Tenuostrongylus Leroux, 1933
Teporingonema Harris, 1985
Tepuinema Diaz-Ungria, 1964
Tercyathellus Borodina, 1974
Tercyathidae
Tercyathus Vologdin, 1932
Terebraria Rafinesque, 1831
Terektigocyathus Vologdin, 1962
Termirhabditis Massey, 1971
Termitichnus Bown, 1982
Ternidens Railliet & Henry, 1909
Terraecyathus Zhuravleva, 1974
Tesella Missarzhevskiy & Grigoryeva, 1981
Tesselaria Pomel, 1887
Tetanonema Steiner, 1928
Tethystrongylus Beveridge, 1983
Tetrabothriostrongylus Mawson, 1960
Tetracanthus Hemprich & Ehrenberg, 1866
Tetracheilonema Diesing, 1861
Tetradenos Linstow, 1904
Tetradomermis Rubtsov, 1967
Tetragomphius Baylis & Daubney, 1923
Tetrastoibopus Sarjeant & Langston, 1994
Tetratheca Sysoev, 1968
Tevidestus Shpanskaia, Maslennikov & Little, 1999
Texicospirura Chitwood & Cordero de Campillo, 1966
Thainema Ivanova, Kozodoi & Spiridonov, 1987
Thaistrongylus Ohbayashi, Kamiya & Bhaibulaya, 1979
Thalaisseina Rafinesque, 1819
Thalamocyathellus Osadchaya, 1979
Thalanema Rafinesque, 1832
Thalassonema Ward, 1932
Thallostonema Beveridge, 1983
Thallusichnus Hu & Meng, 1991
Thambetolepis Jell, 1981
Thamugadia Seurat, 1917
Thaprospirura Sood & Parshad, 1974
Thaumaptilon Conway Morris, 1993
Thecavermieulatus Robbins, 1978
Thecocyathus Vologdin, 1964
Theileriana Monnig, 1924
Thelastomellum Cobb, 1929
Thelastomoides Walton, 1927
Thelazo Pearse, 1933
Theophana Rafinesque, 1815
Therapsipus Hunt, Santucci, Lockley & Olson, 1993
Theroplantigrada Casanovas Cladellas, Ezquerra Miguel, Fernandez Ortega, Perez-Lorente, Santafe Llopis & Torcida Fernandez, 1993
Thoracoscolex Müller & Hinz-Schallreuter, 1993
Thornedia Husain & Khan, 1965
Thraustomermis Song & Peng, 1991
Thrinaxopus Sarjeant & Langston, 1994
Thwaitia Rasheed, 1963
Thylaconema Chandler, 1929
Thylakolenchus Ruhm, 1956
Thylonema Beveridge, 1981
Thylostrongylus Beveridge, 1982
Tianshandiscus Qian & Xiao, 1985
Tianzhushanellidae Conway Morris, 1990
Tibetichnus Yao, Liu & Fu, 1992
Tikusnema Hasegawa, Shiraishi & Rochman, 1992
Timminema Khan, 1977
Timmungella Ivanova, Kozodoi & Spiridonov, 1987
Tipasella Seurat, 1921
Titanoceratophyton Müller, 1766
Toddia Travassos, 1954
Togachitina Wood, 1994
Tokobaevimermis Gafurov & An, 1989
Tollicyathus Tchernyscheva, 1960
Tologoicyathus Voronin, 1988
Tomaculum Groom, 1902
Tombownichnus Mikulas & Genise, 2003
Tommotiidae
Tommotitubulus Fedorov, 1986
Tomocyathidae
Tomocyathus Rozanov, 1960
Tonaudia Travassos, 1918
Tonganoxichnus Mangano, Buatois, Maples & Lanier, 1997
Tonoscolecinema Timm, 1967
Topolinocyathus Yankauskas, 1965
Torellellidae Holm, 1893
Torellidae
Torosocyathella Kotelnikov, 1995
Torosocyathellus Osadchaya, 1979
Torosocyathidae
Torosocyathus
Torquatella Yorke & Maplestone, 1926
Torrestrongylus Vigueras, 1935
Torrowangea Webby, 1970
Torsiomermis Kaiser & Schwank, 1985
Tortilichnus Holub & Kozur, 1983
Tortocyathus Vologdin & Yankauskas, 1968
Tosahelminthes Katto, 1960
Touzeta Petter, 1987
Toxichnus Hitchcock, 1865
Toyonereites Katto, 1962
Trachycyrillium Porter, Meisterfeld & Knoll, 2003
Trachynema Cobb, 1920
Trachypharynx Leiper, 1911
Tractinites Rafinesque, 1831
Transmeristocoprus Bischoff, 1994
Trapezochitina German, 1974
Trapezovitidae
Traucumichnis Ksiazkiewicz, 1977
Travassallodapa López-Neyra, 1945
Travassosascaris Sprent, 1978
Travassosinema Rao, 1958
Travassosnema Moreira & de Oliveira, 1992
Travassospirura Mönnig, 1938
Travassostrongylus Orloff, 1933
Travassozolaimus Vigueras, 1938
Travnema Pereira, 1938
Tremichnus Brett, 1985
Treptichnus Miller, 1889
Triangulina Quilty, 1970
Trianisites Rafinesque, 1819
Triassoaphididae Heie, 1999
Tribactis Dujardin, 1844
Tribrachididae
Tricheilia Wang & Wang, 1991
Tricheilonema Diesing, 1861
Trichens Gervais, 1848
Trichina Owen, 1835
Trichine Bischoff, 1840
Trichinia Bischoff, 1840
Trichnia Tyson, 1903
Trichobaylisia Travassos, 1937
Trichochenia Kou, 1958
Trichodes Linstow, 1874
Trichofreitasia Sutton & Durette-Desset, 1991
Trichohelix Ortlepp, 1922
Trichonchium Siddiqi & Khan, 1963
Trichonema Cobbold, 1874
Trichophycus S.A. Miller & C.B. Dyer, 1878
Trichoskrjabinia Travassos, 1937
Trichospirura Smith & Chitwood, 1967
Trichostrongyella Dikov, 1961
Trichotravassosia Lent & Freitas, 1938
Trichozema Cobbold, 1875
Tricirronema Siddiqi, 1993
Tricontus Dujardin, 1844
Tricorynopus Sarjeant & Langston, 1994
Tridentipes Hitchcock, 1858
Tridentocapillaria Barus & Sergeeva, 1990
Tridontus Khera, 1965
Triforillonia Gehling, Narbonne & Anderson, 2000
Trifurcata Schulz, 1926
Trigonocyrillium Porter, Meisterfeld & Knoll, 2003
Trigonostonema Beveridge, 1981
Trihamus Hitchcock, 1865
Triligulla Siddiqi, 1993
Trilobitichnus Gevers, Frakes, Edwards & Marzolf, 1971
Trilobostrongylus Anderson, 1963
Trininaecyathus Zhuravleva, 1960
Triodontus Looss, 1900
Trionchonema Kreis, 1932
Triplexa Zhao, Zhou Zhen, Chen & Guo, 1998
Triplicatella Conway Morris, 1990
Tripodichnus Walter, 1983
Trispiculascaris Skrjabin, 1916
Trisulcus Hitchcock, 1865
Triversus Sher, 1973
Trochozoon Hatschek, 1878
Trophomermis Johnson & Kleve, 1993
Tropidocerca Diesing, 1851
Tropidurus Wiegmann, 1835
Tropisurus Diesing, 1835
Trypanoxyuris Sandosham, 1950
Tuberculichnus Kslazkiewicz, 1977
Tubericyathidae
Tubericyathus Vologdin, 1977
Tubicoscinus
Tubifexides Novak, 1986
Tubigeorgina Müller & Hinz, 1992
Tubilombricus Bosc, 1819
Tubisalebra Bogush & Brenkl, 1982
Tubulaimus Alekseev & Rassadnikova, 1977
Tubularina Gaillard, 1994
Tubulichnium Ksiazkiewicz, 1977
Tubuligula Boucher & Helleouet, 1977
Tullimonstrum Richardson, 1966
Tumblagoodichnus Trewin & McNamara, 1995
Tumulifungia
Tumulifungiidae
Tumuliolynthidae
Tumuliolynthus Zhuravleva, 1963
Tumulocoscinidae
Tumulocoscinus Zhuravleva, 1960
Tumulocyathellus Zhuravleva, 1960
Tumulocyathidae
Tumulocyathoides Boyarinov & Konyaeva, 1997
Tumulocyathus Zhuravleva, 1960
Tunisostertagia Bernard, 1987
Tupainema Eberhard & Orihel, 1984
Tupaiostrongylus Dunn, 1963
Turbator Goodey, 1943
Turbinella Duan, Cao & Zhang, 1993
Turgidocyathus Vologdin, 1960
Turricyathus Vologdin, 1964
Tuserospina Missarjevsky, 1989
Tutunema Hunt, 1998
Tuvacnema Debrenne & Zhuravlev, 1990
Tuvacnemididae
Tuvina Korde, 1990
Tuxekanella Riding & Soja, 1993
Tylenchidarum Andrássy, 1962
Tylenchinema Goodey, 1930
Tylenchodon Fuchs, 1930
Tylenchodorus Gagarin, 1999
Tylenchomorphus Fuchs, 1914
Tylichnus Osgood, 1970
Tylocyathidae
Tylocyathus Vologdin, 1966
Tylorhabdus Sukul, 1971
Tylotites Luo & Hu, 1999
Tympanites Duan, Cao & Zhang, 1993
Typhloesidae
Typhloesus Conway Morris, 1990
Typhlonema Kreis, 1938
Typhlopsia Barus & Coy Otero, 1978
Tytofilaria Rodrigues & Franco, 1964
Tytthocyathus Vologdin, 1977
Uchirites Macsotay, 1967
Udzhaites Vassiljeva, 1986
Ularofilaria Lubimov, 1946
Umbichnus Martinell, Domenech & Bromley, 1999
Umbilicus Duan & Cao, 1989
Umbonichnus Karaszewski, 1974
Umingmakstrongylus Hoberg, Polley, Gunn & Nishi, 1995
Unarites Macsotay, 1967
Ungulichites Ding & Li, 1996
Unifissurinella Poignant, 1991
Uniglobites Pleydell & Jones, 1988
Uniovaria Khera, 1969
Uniqaxonchium Dhanam & Shamim Jairajpuri, 1999
Unisulcus Hitchcock, 1858
Upsiloides Byrne & Branson, 1941
Uracanthus Diesing, 1861
Uralocyathella Zhuravleva, 1960
Uralocyathellidae
Urbanonema Travassos & Kloss, 1958
Urcyathella
Urcyathus Vologdin, 1940
Urdacyathus Perejon & Moreno, 1978
Urnatellidae
Urnochitina Paris, 1981
Urochitina Taugourdeau & Jekhowsky, 1960
Urophysalus Costa, 1869
Usloncyathidae
Usloncyathus Fonin, 1966
Ussuricyathellus Voronin, 1988
Ussuricyathus
Utahphospha Muller & Miller, 1976
Utaphosphidae
Utatsuia Hatai & Murata, 1976
Uvaites Badve & Ghare, 1978
Uvanogelia Kozur & Mostler, 1972
Vaccipraticola Nilsson & Bengtson, 1981
Vachonisiiformes Starobogatov, 1985
Vadimocyathus Kashina, 1979
Vagorichnus Buatois, Mangano, Wu Xiantao & Zhang Guocheng, 1995
Valdainis Fedonkin, 1983
Vampyronema Hunt, 1993
Variasquamata Mehta & Raski, 1971
Variotuba Eisenack, 1978
Vasicyathus Vologdin, 1977
Vaucherus Durette-Desset, 1980
Vauzutsinia
Vaveliksis Fedonkin, 1983
Vaznema Freitas & Lent, 1948
Velatachitina Poumot, 1968
Velicyathus Debrenne, 1964
Vena Gallandat, 1773
Vendichnus Fedonkin, 1979
Vendomiidae
Ventelia Travassos & Kloss, 1958
Ventogyrus Ivantsov & Grazhdankin, 1997
Ventriculocyathus Vologdin, 1931
Veolynthus Boyarinov & Konyaeva, 1997
Vermichnus Hecker, 1980
Vermiculus Dunglison, 1895
Vermiforichnus Cameron, 1969
Vermiforma Cloud, 1976
Vermitubus Hatai, Murata & Kawakami, 1972
Vernanimalcula Chen, Bottjer, Oliveri, Dornbos, Gao, Ruffins, Chi, Li & Davidson, 2004
Veronicacyathidae
Veronicacyathus Debrenne, 1973
Verrucicyathus Vologdin, 1977
Versternema Bain, Chabaud & Burger, 1992
Vertocyathus Fonin, 1985
Vertummus Blainville, 1828
Vestibulosetaria Vogel & Gabaldon, 1932
Vetteria Allgén, 1926
Vetulicolidae Hou et al., 1999
Veversia Thapar, 1925
Vialovena Korde, 1989
Viannella Travassos, 1920
Vinnalochitina Sutherland, 1994
Virgilochitina Tasch & Hutter, 1978
Viskoviella Bielokrys, 1995
Vitreachitina Nestor, 1994
Vitulus Rafinesque, 1815
Viverranisakis Soota & Chaturvedi, 1971
Viverrostrongylus Asakawa, Ohbayashi & Ow-Yang, 1986
Volborthellidae
Volodia Sosnovskaja, 1980
Vologdinellidae
Vologdinocyathellus
Vologdinocyathidae
Vologdinocyathus Jaroshevich, 1957
Vologdinophyllidae
Vologdinophyllum Radygin, 1962
Volutacoprolithus Bischoff, 1994
Volvacyathus Debrenne, 1960
Vondrichnus Genise & Bown, 1994
Voroninicyathus Zhuravleva, 1974
Voznesenskicyathus Rodionova, 1967
Vulcanonema Travassos & Kloss, 1958
Wadeichnus Cook & Bann, 2000
Waerebekeia Adamson & Anderson, 1985
Wakubitinema Hasegawa, 1988
Walcottia Miller & Dyer, 1878
Wallabinema Beveridge, 1983
Wallerites Fischer de Waldheim, 1830
Walpia White, 1929
Waltheria Gaucher & Sprechmann, 1999
Waltonella Schacher, 1975
Waltonia Schacher & Crans, 1973
Wanaristrongylus Jones, 1987
Warrenius Hall, 1916
Warriootacyathidae
Warriootacyathus Gravestock, 1984
Warrriootacyathus
Warvichnium Walter, 1985
Wasimellus Bloemers & Wanless, 1996
Welchiella Gupta & Kaur, 1978
Westgardia Rowland & Carlson, 1983
Wetamena Dale, 1967
Williamicyathus Zhuravlev, 1987
Willmottia Mawson, 1982
Wingertshellicus Briggs & Bartles, 2001
Witoldinema Brzeski, 1960
Wiwaxiidae
Woodwardostrongylus Wahid, 1964
Woolleya Mawson, 1973
Wrighticyathidae
Wrighticyathus Kruse, 1978
Wuinema Yu & Wang, 1992
Wushichites Qian & Xiao, 1985
Wymania Wehr & Hwang, 1957
Xanthomyria Budd, Hogstrom & Gogin, 2001
Xenocordon Mawson, 1982
Xenokalymma Eisenack, 1968
Xenonchium Siddiqi & Khan, 1964
Xenoturbellida
Xenusion Pompeckj, 1927
Xericola Durette-Desset, 1974
Xeroxyuris Hugot, 1995
Xestecyathidae
Xestecyathus Kruse, 1982
Xiandongtubulus Qian & Zhang, 1985
Xiangquanheichnus Yang & Song, 1985
Xiaoheiqingella Hu, 2002
Xishania Hu, 2002
Xizangichnum Yang, 1983
Xunjiansiella Hua & Jian, 1993
Xustrostoma Adamson & van Waerebeke, 1984
Xyo Cobb, 1898
Yamanskasia Shpanskaja, Maslennikov & Little, 1999
Yangtzesclerites Chen, Chen & Zhang, 1981
Yangziichnus Yang, 1984
Yanjiichnus Yao, 1987
Yaravidium Borrello, 1967
Yatesia Bain, Baker & Chabaud, 1982
Yatinema Asakawa & Ohbayashi, 1986
Yhecyathus Belyaeva & Yuan, 1995
Yorgia Ivantsov, 1999
Yorgiidae Ivantsov, 2001
Yorkeispirura Skrjabin, 1931
Yseria Gedoelst, 1919
Yuanjiapingella Yue, 1984
Yubeldus Khan, Azmi & Chawla, 1979
Yudaiella Zhang & Hua, 2000
Yudjaicyathus Zhuravlev, 1983
Yukonocyathus
Yuliunia He & Xie, 1989
Yunmengshanichnus Hu & Meng, 1991
Yunnanichnus Li & Yang, 1988
Yunnanocaris Hou, 1999
Yunnanodus Wang & Jing, 1980
Yunnanpus Chen & Huang, 1993
Yunqueus Thorns, 1964
Zaglonema Durette-Desset & Beveridge, 1981
Zalophidera Siddiqi, 1982
Zalophora Hunt, 1994
Zanclonychopus Sarjeant & Langston, 1994
Zebrincola Ricci, 1939
Zelandodera Wouts, 1973
Zenkoxyuris Quentin, 1975
Zeugites Qian Yi, Chen & Chen, 1979
Zeylanema Yeh, 1960
Zhadichnus Yang & Song, 1985
Zhejiangorhabdion Yue & Zhao, 1993
Zhijinites Qian Yi, 1978
Zhijinitidae
Zhuravlevaecyathidae
Zhuravlevaecyathus Rozanov, 1964
Zhurinia Missarjevsky, 1989
Ziguichnus Yang, 1984
Ziguivermites Chen, Xiao & Yuan, 1994
Zocodum Rafinesque, 1814
Zonacoscinidae
Zonacoscinus Debrenne, 1971
Zonacyathellus Zhuravleva, 1974
Zonacyathus Bedford, 1937
Zoochtedria Rafinesque, 1815
Zunyicyathus Debrenne, Kruse & Zhang Sengui, 1991
Zyxispinifer Hunt, 2000
- Animalia