1. Subfamily Adoncholaiminae Gerlach & Riemann, 1974
   1. Genus Admirandus Belogurov & Belogurova, 1979
   2. Genus Adoncholaimus Filipjev, 1918
   3. Genus Kreisoncholaimus Rachor, 1969
   4. Genus Meyersia Hopper, 1967
   5. Genus Metoncholaimoides Wieser, 1954 accepted as Adoncholaimus Filipjev, 1918 (Lo Russo et al. 2016: synonymized with Adoncholaimus)
2. Genus Dentolaimoides Khan, 1994
3. Subfamily Krampiinae
   1. Genus Krampia Ditlevsen, 1921
4. Subfamily Octonchinae
   1. Genus Octonchus Clark, 1961
   2. Genus Paroctonchus Shi & Xu, 2016
   3. Genus Patagonema Pastor De Ward, Lo Russo & Villares, 2015
5. Genus Oloncholaimus Mordukhovich, Zograf, Saulenko & Fadeeva, 2020
6. Subfamily Oncholaimellinae Filipjev, 1916
   1. Genus Oncholaimelloides Timm, 1969
   2. Genus Oncholaimellus de Man, 1890
   3. Genus Oncholaimoides Chitwood, 1937
   4. Genus Viscosia de Man, 1890
   5. Genus Meroviscosia Kreis, 1932 accepted as Viscosia de Man, 1890 (Lorenzen, 1981, 1994 p 251: synonymized with Viscosia)
   6. Genus Cacolaimus Kreis, 1932 (uncertain > taxon inquirendum, Description based on a juvenile specimen)
7. Subfamily Oncholaiminae Filipjev, 1916
   1. Genus Fotolaimus Belogurova & Belogurov, 1974
   2. Genus Metaparoncholaimus De Coninck & Schuurmans Stekhoven, 1933
   3. Genus Metoncholaimus Filipjev, 1918
   4. Genus Oncholaimus Dujardin, 1845
   5. Genus Prooncholaimus Micoletzky, 1924
   6. Genus Pseudoncholaimus Kreis, 1932
   7. Genus Wiesoncholaimus Inglis, 1966
   8. Genus Megalolaimus Timm, 1961 accepted as Elzalia Gerlach, 1957
   9. Genus Oncholaimium Cobb, 1930 accepted as Oncholaimus Dujardin, 1845
   10. Genus Polydontus Schulz, 1932 accepted as Octonchus Clark, 1961 (unaccepted > junior homonym)
8. Subfamily Pelagonematinae
   1. Genus Anoncholaimus Cobb, 1920
   2. Genus Bradybucca Schuurmans Stekhoven, 1956
   3. Genus Curvolaimus Wieser, 1953
   4. Genus Pelagonema Cobb, 1894
   5. Genus Pelagonemella Kreis, 1932
   6. Genus Phaenoncholaimus Kreis, 1934
   7. Genus Pseudopelagonema Kreis, 1932
   8. Genus Vasculonema Kreis, 1928
   9. Genus Cavilaimus Wieser, 1951 accepted as Pelagonema Cobb, 1894
   10. Genus Metapelagonema Sergeeva, 1972 accepted as Pandolaimus Allgén, 1929 (Jensen, P. (1976). Redescription of the marine nematode Pandolaimus latilaimus (Allgén, 1929), its synonyms and relationships to the Oncholaimidae.)
9. Subfamily Pontonematinae
   1. Genus Filoncholaimus Filipjev, 1927
   2. Genus Phylloncholaimus Bussau, 1993
   3. Genus Phylloncholaimus Bussau, 1995
   4. Genus Pontonema Leidy, 1855
   5. Genus Convexolaimus Kreis, 1928 accepted as Pontonema Leidy, 1855 (Lorenzen, 1981 p 319 : synonymization with Pontonema)
   6. Genus Paroncholaimus Filipjev, 1916 accepted as Pontonema Leidy, 1855 (Cobb & Steiner, 134 p 34: synonymized with Pontonema)
   7. Genus Pseudoparoncholaimus Kreis, 1932 accepted as Filoncholaimus Filipjev, 1927
10. Genus Anoncholaimus Schuurmans Stekhoven, 1950 accepted as Bradybucca Schuurmans Stekhoven, 1956 (unaccepted > junior homonym)
11. Genus Fimbria Cobb, 1894 accepted as Fimbrilla Cobb in Stiles & Hassal, 1905 (homonym to Fimbria Bohadesh, 1761 (Mollusca))
12. Subfamily Mononcholaiminae De Coninck, 1965 (uncertain > taxon inquirendum, The only genus Mononcholaimus is synonymized with Viscosia)
    1. Genus Mononcholaimus Kreis, 1924 accepted as Viscosia de Man, 1890 ((Lorenzen, 1994 translated version))

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