1. Genus Astemma Örsted, 1843
2. Genus Gordius non Linnaeus, 1758
3. Genus Hecate Girard, 1852
4. Genus Legnodesmus Ehlers, 1869 †
5. Genus Nematodemus Graff, 1896
6. Genus Nemertes Cuvier, 1817
7. Genus Nemertites MacLeay, 1839 †
8. Genus Otoloxorrhochma
9. Genus Planaria Müller, 1776
10. Genus Polina Stimpson, 1857
11. Genus Polystemma Ehrenberg, 1828
12. Genus Poseidon Girard, 1852
13. Genus Procarinina Bergendal, 1902
14. Genus Quatrefagea Diesing, 1862
15. Genus Renieria Girard, 1853
16. Genus Scotia Leuckart, 1849
17. Genus Serpentaria Goodsir, 1845
18. Genus Stylus
19. Genus Taeniosoma
20. Genus Valencia Quatrefages, 1846
21. Genus Valenciennesia
22. Genus Vermiculus Dalyell, 1853
23. Genus Xenistum Blanchard, 1845
24. Genus Meckelia Leuckart, 1828 accepted as Cerebratulus Renier, 1804
25. Genus Ophyocephalus Chiaje, 1829 accepted as Ophiocephalus Blainville, 1828 accepted as Lineus Sowerby, 1806 (synonym)
26. Genus Polia Delle Chiaje, 1822 accepted as Baseodiscus Diesing, 1850 (Homonymy)
27. Genus Acicula Renier, 1807 (uncertain > nomen dubium)
28. Genus Ascaris Linnaeus, 1758 (uncertain > nomen dubium, Includes some species now assigned to Nemertea, also one species described as nematode, actually a dipteran larva)
29. 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. )
30. Genus Cephalonema Stimpson, 1857 (uncertain > nomen dubium)
31. Genus Chloraima Kölliker, 1845 (uncertain > nomen dubium)
32. Genus Lobilabrum Blainville, 1828 (uncertain > taxon inquirendum)
33. Genus Pararhynchoscolex Czerniavsky, 1880 (uncertain > nomen dubium)

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