Acantholaimus Allgén, 1933 (basis of record)
Acanthonchus Cobb, 1920 (basis of record)
Acanthopharyngoides Chitwood, 1936 (basis of record)
Acanthopharynx Marion, 1870 (basis of record)
Actinonema Cobb, 1920 (basis of record)
Adoncholaiminae Gerlach & Riemann, 1974 (basis of record)
Adoncholaimus Filipjev, 1918 (basis of record)
Aegialoalaimidae Lorenzen, 1981 (basis of record)
Aegialoalaimus de Man, 1907 (basis of record)
Alaimella Cobb, 1920 (basis of record)
Alaimidae Micoletzky, 1922 (basis of record)
Amphidelus Thorne, 1939 (basis of record)
Amphimonhystera Allgén, 1929 (basis of record)
Anoplostoma Bütschli, 1874 (basis of record)
Anoplostomatidae Gerlach & Riemann, 1974 (basis of record)
Anoplostomatinae (basis of record)
Antarcticonema Timm, 1978 (basis of record)
Anticoma Bastian, 1865 (basis of record)
Anticomidae Filipjev, 1918 (basis of record)
Anticomopsis Micoletzky & Kreis, 1930 (basis of record)
Anticyathus Cobb, 1920 (basis of record)
Anticyclus Cobb, 1920 (basis of record)
Antomicron Cobb, 1920 (basis of record)
Antopus Cobb, 1933 (basis of record)
Aponchiidae Gerlach, 1963 (basis of record)
Aponema Jensen, 1978 (basis of record)
Araeolaimus de Man, 1888 (basis of record)
Archepsilonema Steiner, 1927 (basis of record)
Astomonema Ott, Rieger, Rieger & Enderes, 1982 (basis of record)
Atrochromadora Wieser, 1959 (basis of record)
Axonolaimidae Filipjev, 1918 (basis of record)
Axonolaimoidea Filipjev, 1918 (basis of record)
Axonolaimus de Man, 1889 (basis of record)
Barbonema Filipjev, 1927 (basis of record)
Barbonematinae Platonova, 1976 (basis of record)
Bathyepsilonema Steiner, 1927 (basis of record)
Bathylaimus Cobb, 1894 (basis of record)
Bathyodontina (basis of record)
Belbolla Andrássy, 1973 (basis of record)
Bradybucca Schuurmans Stekhoven, 1956 (basis of record)
Calligyrus Lorenzen, 1969 (basis of record)
Calyptronema Marion, 1870 (basis of record)
Camacolaiminae Micoletzky, 1924 (basis of record)
Camacolaimus de Man, 1889 accepted as Deontolaimus de Man, 1880 (basis of record)
Ceramonema Cobb, 1920 (basis of record)
Ceramonematidae Cobb, 1933 (basis of record)
Cervonema Wieser, 1954 (basis of record)
Chaetonema Filipjev, 1927 (basis of record)
Chaetonematinae Gerlach & Riemann, 1974 (basis of record)
Cheironchus Cobb, 1917 (basis of record)
Chitwoodia Gerlach, 1956 (basis of record)
Choanolaimus de Man, 1880 (basis of record)
Choniolaimus Ditlevsen, 1918 (basis of record)
Chromadora Bastian, 1865 (basis of record)
Chromadorella Filipjev, 1918 (basis of record)
Chromadoria (basis of record)
Chromadorida (basis of record)
Chromadoridae Filipjev, 1917 (basis of record)
Chromadorina (basis of record)
Chromadorinae Filipjev, 1917 (basis of record)
Chromadorissa Filipjev, 1917 (basis of record)
Chromadorita Filipjev, 1922 (basis of record)
Chromadoroidea Filipjev, 1917 (basis of record)
Chromaspirina Filipjev, 1918 (basis of record)
Cobbionema Filipjev, 1922 (basis of record)
Comesoma Bastian, 1865 (basis of record)
Comesomatidae Filipjev, 1918 (basis of record)
Comesomatinae Filipjev, 1918 (basis of record)
Coninckia Gerlach, 1956 (basis of record)
Coninckiidae Lorenzen, 1981 (basis of record)
Crenopharynginae Platonova, 1976 (basis of record)
Crenopharynx Filipjev, 1934 (basis of record)
Cricolaimus Southern, 1914 (basis of record)
Cryptenoplus Riemann, 1966 (basis of record)
Curvolaimus Wieser, 1953 (basis of record)
Cyartonema Cobb, 1920 (basis of record)
Cyatholaimidae Filipjev, 1918 (basis of record)
Cyatholaiminae Filipjev, 1918 (basis of record)
Cyatholaimus Bastian, 1865 (basis of record)
Cylicolaiminae Platonova, 1970 (basis of record)
Cylicolaimus de Man, 1889 (basis of record)
Cynura Cobb, 1920 (basis of record)
Dagda Southern, 1914 (basis of record)
Daptonema Cobb, 1920 (basis of record)
Dasynemella Cobb, 1933 (basis of record)
Dasynemoides Chitwood, 1936 (basis of record)
Demonema Cobb, 1894 (basis of record)
Denticulella Cobb, 1933 (basis of record)
Deontolaimus de Man, 1880 (basis of record)
Deontostoma Filipjev, 1916 (basis of record)
Desmodora de Man, 1889 (basis of record)
Desmodoridae Filipjev, 1922 (basis of record)
Desmodorinae Filipjev, 1922 (basis of record)
Desmodoroidea Filipjev, 1922 (basis of record)
Desmolaiminae Schneider, 1926 (basis of record)
Desmoscolecidae Shipley, 1896 (basis of record)
Desmoscolecina (basis of record)
Desmoscolecinae (basis of record)
Desmoscolecoidea Shipley, 1896 (basis of record)
Desmoscolex Claparède, 1863 (basis of record)