1. Genus Dikentrocephalus Wedl, 1855
2. Genus Diplohystera Onorato de Cillis, 1918
3. Genus Fellicola Petter & Køie, 1993
4. Genus Frostina Gerlach & Riemann, 1974
5. Genus Heligmus Dujardin, 1845
6. Genus Iotalaimus Cobb, 1920
7. Genus Macfadyenia Allgén, 1953
8. Genus Notosouthernia Allgén, 1959
9. Genus Potamonema Leidy, 1856
10. Family Cylindrolaimidae Micoletzky, 1922 accepted as Diplopeltidae Filipjev, 1918
11. Genus Acmaeolaimus Filipjev, 1918 (uncertain > taxon inquirendum)
12. Genus Amblyura Ehrenberg, 1828 (uncertain > taxon inquirendum)
13. Genus Choronema Cobb, 1920 (uncertain > taxon inquirendum)
14. Genus Colpurella Cobb, 1920 (uncertain > taxon inquirendum)
15. Genus Hyalaimus Cobb, 1920 (uncertain > taxon inquirendum)
16. Genus Leptodera Dujardin, 1845 (uncertain > taxon inquirendum)
17. Genus Litonema Cobb, 1920 (uncertain > taxon inquirendum)
18. Genus Longitubopharynx Allgén, 1959 (uncertain > taxon inquirendum)
19. Genus Nema Leidy, 1856 (uncertain > taxon inquirendum)
20. Genus Nuadella Allgén, 1928 (uncertain > taxon inquirendum)
21. Genus Phanoglene von Nordmann, 1840 (uncertain > taxon inquirendum)
22. Genus Pseudodilaimus Kreis, 1928 (uncertain > taxon inquirendum)
23. Genus Rhabdotoderma Marion, 1870 (uncertain > taxon inquirendum)
24. Genus Rhinonema Allgèn, 1928 (uncertain > taxon inquirendum)

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