Nematoda
Achromadoridae
Acmaeolaimus Filipjev, 1918
Aegialoalaimidae
Amblyura Hemprich & Ehrenberg, 1828
Amphimonohystera
Amphimonohystrella
Antarticonema
Araeolaimida
Benthimermithidae Petter, 1980
Bolbonema Cobb, 1920
Cephaloanticoma
Chromadoropsis Filipjev, 1918
Chronogastridae Gagarin, 1975
Convexonolaimus
Corythosma
Croconema Cobb, 1920
Cygonema
Desmodorida De Coninck, 1965
Desmoscolecida Filipjev, 1929
Diplohystera Onorato de Cillis, 1918
Dorylaimida Pearse, 1942
Dracogallus
Dracogarelus
Draconematoidea
Enoplida Filipjev, 1929
Ethmolaimidae Filipjev & Stekhoven, 1941
Frostina Gerlach & Riemann, 1974
Hypodontolaimidae
Iotalaimus Cobb, 1920
Jägerskiöldia Filipjev, 1916
Jagerskioldia Filipjev, 1916
Kreisia Allgén, 1929
Litonema Cobb, 1920
Longitubopharynx Allgen, 1959
Macfadyenia Allgén, 1953
Mermithida Hyman, 1951
Mesancanthion
Metachromadoroides Timm, 1961
Monhysterida Filipjev, 1929
Mononchida
Muspiceidae
Nema Dejean, 1821
Neotonchidae Wieser & Hopper, 1966
Notacamacolaimus
Notocamacolaimus Allgén, 1959
Notosouthernia Allgen, 1959
Ohridiidae
Paramicrolaimidae
Peresianidae
Phanoglene Nordmann, 1840
Pheronus
Phlyctainophoridae
Potamonema Leidy, 1856
Prochaetosomatidae
Pseudodilaimus Kreis, 1928
Pseudosteinieria
Rhabdotoderma Marion, 1870
Rhadinematidae
Simpliconematidae
Simploconema
Spirinidae
Synanema
Tarvaiidae
Trichocephalida
Trichromadorita Timm, 1961
Triplonchida
Tubolaimoididae
Xenodesmodora Wieser, 1951
