1. Genus Astemma Örsted, 1843
2. Genus Gordius non Linnaeus, 1758
3. Genus Hecate Girard, 1852
4. Genus Nematodemus Graff, 1896
5. Genus Nemertes Cuvier, 1817
6. Genus Otoloxorrhochma
7. Genus Planaria Müller, 1776
8. Genus Polina Stimpson, 1857
9. Genus Polystemma Ehrenberg, 1828
10. Genus Poseidon Girard, 1852
11. Genus Procarinina Bergendal, 1902
12. Genus Quatrefagea Diesing, 1862
13. Genus Renieria Girard, 1853
14. Genus Scotia Leuckart, 1849
15. Genus Serpentaria Goodsir, 1845
16. Genus Stylus
17. Genus Taeniosoma
18. Genus Valencia Quatrefages, 1846
19. Genus Valenciennesia
20. Genus Vermiculus Dalyell, 1853
21. Genus Xenistum Blanchard, 1845
22. Genus Meckelia Leuckart, 1828 accepted as Cerebratulus Renier, 1804
23. Genus Ophyocephalus Chiaje, 1829 accepted as Ophiocephalus Blainville, 1828 accepted as Lineus Sowerby, 1806 (synonym)
24. Genus Polia Delle Chiaje, 1822 accepted as Baseodiscus Diesing, 1850 (Homonymy)
25. Genus Acicula Renier, 1807 (uncertain > nomen dubium)
26. Genus Ascaris Linnaeus, 1758 (uncertain > nomen dubium, Includes some species now assigned to Nemertea, also one species described as nematode, actually a dipteran larva)
27. Genus Borlasia Oken, 1815 (uncertain > taxon inquirendum, Genus was established for B angliae Oken, 1815 – now syn. with Lineus longissimus but the generic name has subsequently been used for species since transferred to several other genera. No valid Borlasia-species exist today. )
28. Genus Cephalonema Stimpson, 1857 (uncertain > nomen dubium)
29. Genus Chloraima Kölliker, 1845 (uncertain > nomen dubium)
30. Genus Lobilabrum Blainville, 1828 (uncertain > taxon inquirendum)
31. Genus Pararhynchoscolex Czerniavsky, 1880 (uncertain > nomen dubium)

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