Syllidae Grube, 1850
Chaetosyllis umbrina Grube in Fauvel, 1923
Syllis abyssicola Ehlers, 1874
Syllis alosae San Martín, 1992
Syllis alternata Moore, 1908
Syllis amica Quatrefages, 1866
Syllis armillaris (O.F. Müller, 1776)
Syllis atlantica Cognetti, 1960
Syllis australiensis Hartmann-Schröder, 1979
Syllis bacilligera Claparède, 1868
Syllis barbata San Martín, 1992
Syllis bella Chamberlin, 1919
Syllis beneliahuae (Campoy & Alquézar, 1982)
Syllis benguelana
Syllis biocula (Czerniavsky, 1881)
Syllis bisetosa
Syllis brasiliensis McIntosh, 1885
Syllis breviarticulata Grube, 1857
Syllis brevicirrata Mc Intosh, 1908
Syllis brevicirris Hansen, 1882
Syllis brevicollis Ehlers, 1874
Syllis brevis Schmarda, 1861
Syllis buchholziana Grube, 1877
Syllis caeca (Katzmann, 1973)
Syllis californica Kinberg, 1866
Syllis castroviejoi Capa, San Martín & López, 2001
Syllis ciliata Mecznicow, 1865
Syllis cirrita Lee & Rho, 1994
Syllis columbretensis (Campoy, 1982)
Syllis compacta Gravier, 1900
Syllis corallicola Verrill, 1900
Syllis cornuta Rathke, 1843
Syllis corsucans (Haswell, 1886)
Syllis cruzi Núñez & San Martín, 1991
Syllis curticirris Monro, 1937
Syllis czerniavskyi (Czerniavsky, 1881)
Syllis danieli San Martín, 1992
Syllis elongata Day, 1949
Syllis ergeni Çinar, 2005
Syllis erythropis Grube, 1878
Syllis exiliformis Imajima, 2003
Syllis eximia Malm, 1874
Syllis fasciata Malmgren, 1867
Syllis ferrani Alós & San Martín, 1987
Syllis filiformis Rullier, 1972
Syllis fissipara Krohn, 1852
Syllis flaccida Grube, 1878
Syllis fulgarans Audouin & Milne Edwards, 1833
Syllis fusicornis Schmarda, 1861
Syllis garciai (Campoy, 1982)
Syllis gerlachi (Hartmann-Schröder, 1960)
Syllis gerundensis (Alós & Campoy, 1981)
Syllis glandulata Nogueira & San Martin, 2002
Syllis golfonovensis (Hartmann-Schröder, 1962)
Syllis gracilis Grube, 1840
Syllis heterochaeta Moore, 1909
Syllis hyalina Grube, 1863
Syllis hyllebergi (Licher, 1999)
Syllis hyperioni Dorsey & Phillips, 1987
Syllis incisa (O. Fabricius, 1780)
Syllis jorgei San Martín & López, 2000
Syllis kabilica Ben-Eliahu, 1977
Syllis krohni Ehlers, 1864
Syllis latifrons Grube, 1857
Syllis licheri Ravara, San Martín & Moreira, 2004
Syllis limbata Grube, 1880
Syllis longesegmentata Grube, 1857
Syllis lutea (Hartmann-Schröder, 1960)
Syllis lyrochaetus Grube, 1878
Syllis macroceras Grube, 1857
Syllis macroura Schmarda, 1861
Syllis maculosa Milne Edwards, 1845
Syllis maryae San Martín, 1992
Syllis mayeri Musco & Giangrande, 2005
Syllis monilaris (Savigny, 1812)
Syllis moniliformis Savigny, 1822
Syllis mytilorum Studer, 1889
Syllis neglecta Grube, 1870
Syllis nidrosiensis Bidenkap, 1907
Syllis nigra Augener, 1925
Syllis nigricirris Grube, 1863
Syllis nigriscens Grube, 1878
Syllis notocera Ehlers, 1905
Syllis nuchalis (Hartmann-Schröder, 1960)
Syllis obscura Grube, 1857
Syllis oerstedi (Malmgren, 1867)
Syllis onkylochaeta Hartmann-Schröder, 1991
Syllis ortizi San Martín, 1992
Syllis parapari San Martín & López, 2000
Syllis parturiens Haswell, 1920
Syllis pectinans Haswell, 1920
Syllis picta Grube, 1870
Syllis pontica (Czerniavsky, 1881)
Syllis pontxioi San Martín & López, 2000
Syllis prolifera Krohn, 1852
Syllis prolixa Ehlers, 1901
Syllis pseudoarmillaris Nogueira & San Martin, 2002
Syllis pulvinata (Langerhans, 1881)
Syllis punctulata Haswell, 1920
Syllis quadrifasciata Fischli, 1900
Syllis quaternaria Moore, 1906
Syllis ramosa McIntosh, 1879
Syllis regulata
Syllis remex Chamberlin, 1919
Syllis riojai (San Martin, 1990)
Syllis robertianae McIntosh, 1885
Syllis rosea (Langerhans, 1879)
Syllis rudolphi Delle Chiaje, 1841
Syllis sardai San Martín, 1992
Syllis schulzi (Hartmann-Schröder, 1960)
Syllis sclerolaema Ehlers, 1901
Syllis sexoculata Ehlers, 1864
Syllis singulisetis Grube, 1878
Syllis stenura Blanchard in Gay, 1849
Syllis taprobanensis
Syllis tegulum
Syllis tiedemanni Delle Chiaje, 1841
Syllis torquata Marion & Bobretzky, 1875
Syllis truncata Haswell, 1920
Syllis tyrrhena (Licher & Kuper, 1998)
Syllis umbricolor Grube, 1878
Syllis valida Grube, 1857
Syllis variegata Grube, 1860
Syllis violacea Grube, 1870
Syllis vittata Grube, 1840
Syllis vivipara Krohn, 1869
Syllis westheidei San Martín, 1984
Syllis zreucui