1. Genus Aborjinia Özdikmen, 2010
2. Subfamily Barbonematinae Platonova, 1976
   1. Genus Barbonema Filipjev, 1927
3. Subfamily Cylicolaiminae Platonova, 1970
   1. Genus Cylicolaimus de Man, 1889
   2. Genus Metacylicolaimus Schuurmans Stekhoven, 1946
   3. Genus Paracylicolaimus Platonova, 1970
   4. Genus Nudolaimus Allgen, 1929 accepted as Cylicolaimus de Man, 1889 (synonimized with Cylicolaimus by Allgen, 1933)
4. Subfamily Deontostomatinae Belogurov & Fadeeva, 1985
   1. Genus Deontostoma Filipjev, 1916
   2. Genus Tapia Belogurov & Fadeeva, 1985
5. Subfamily Leptosomatinae Filipjev, 1916
   1. Genus Bongersia Platonova, 1988
   2. Genus Leptosomatides Filipjev, 1918
   3. Genus Leptosomatum Bastian, 1865
   4. Genus Leptosomella Filipjev, 1927
   5. Genus Orthophallonema Bongers, 1983
   6. Genus Paraleptosomatides Mawson, 1956
   7. Genus Syringonomus Hope & Murphy, 1969
   8. Genus Tubolaimella Cobb, 1933
   9. Genus Gullmarnia Allgén, 1929 accepted as Klugea Filipjev, 1927
   10. Genus Parabarbonema Inglis, 1964 accepted as Platycomopsis Ditlevsen, 1926
6. Genus Paraborjinia Zograf, Semenchenko & Mordukhovich, 2024
7. Subfamily Platycominae Platonova, 1976
   1. Genus Platycoma Cobb, 1894
   2. Genus Platycomopsis Ditlevsen, 1926
   3. Genus Proplatycoma Platonova, 1976
   4. Genus Pseudoplatycoma Chen, 2015
   5. Genus Dactylonema Filipjev, 1927 accepted as Platycomopsis Ditlevsen, 1926 (Filipjev, 1927 p : 201)
   6. Genus Pilosinema Platonova, 1976 accepted as Platycomopsis Ditlevsen, 1926 (Cheng, 2015)
8. Subfamily Synonchinae Platonova, 1970
   1. Genus Anivanema Platonova, 1976
   2. Genus Corythostoma Hope & Murphy, 1972
   3. Genus Eusynonchus Platonova, 1970
   4. Genus Macronchus Inglis, 1964
   5. Genus Paratuerkiana Platonova, 1970
   6. Genus Platonova Mordukhovich et al, 2019
   7. Genus Sadkonavis Platonova, 1979
   8. Genus Synonchoides Wieser, 1956
   9. Genus Synonchus Cobb, 1894
   10. Genus Triaulolaimus Platonova, 1979
   11. Genus Tuerkiana Platonova, 1970
   12. Genus Fiacra Southern, 1914 accepted as Synonchus (Fiacra) Southern, 1914
   13. Genus Jägerskiöldia Filipjev, 1916 accepted as Synonchus Cobb, 1894
9. Subfamily Thoracostomatinae De Coninck, 1965
   1. Genus Pseudocella Filipjev, 1927
   2. Genus Thoracostoma Marion, 1870
   3. Genus Hemipsilus de Quatrefages, 1846 accepted as Thoracostoma Marion, 1870
10. Subfamily Triceratonematinae Belogurov & Fadeeva, 1985
    1. Genus Pseudotriceratonema Belogurov & Fadeeva, 1985
    2. Genus Triceratonema Platonova, 1976
11. Genus Ritenbenkia Allgén, 1957 (uncertain > nomen dubium, Hope & Murphy, 1972: dubious genus)

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