1. Family Amphiporidae Örsted, 1843
2. Genus Annulonemertes Berg, 1985
3. Genus Atrionemertes Senz, 1993
4. Family Carcinonemertidae Sumner, Osburn & Cole, 1913
5. Genus Cyanonemertes Iwata, 2007
6. Family Emplectonematidae Bürger, 1904
7. Genus Frontonemertes Iwata, 2006
8. Genus Geonemertes Semper, 1863
9. Family Malacobdellidae Blanchard, 1847
10. Family Neesiidae Chernyshev, 2005
11. Family Ototyphlonemertidae Coe, 1940
12. Family Poseidonemertidae Chernyshev, 2002
13. Family Prosorhochmidae Bürger, 1895
14. Family Prostomatidae Bürger, 1904
15. Genus Raygibsonia Sundberg, Chernyshev, Kajihara, Kånneby & Strand, 2009
16. Family Sacconemertidae Chernyshev, Timoshkin & Kawakatsu, 1998
17. Genus Satellitenemertes Iwata, 2006
18. Family Tetrastemmatidae Hubrecht, 1879
19. Family Zygonemertidae Chernyshev, 2005
20. Subfamily Divanellinae Chernyshev, 1993 accepted as Amphiporidae Örsted, 1843 (unaccepted > junior subjective synonym)
21. Family Fasciculonemertidae accepted as Poseidonemertidae Chernyshev, 2002 (nomen nudum)
22. Family Loxorrhochmidae Diesing, 1862 accepted as Tetrastemmatidae Hubrecht, 1879 (unaccepted > nomen oblitum)
23. Genus Ophionemertes Verrill, 1874 accepted as Amphiporus Ehrenberg, 1831 (Synonym)
24. Family Otonemertidae Envall & Sundberg, 1998 accepted as Ototyphlonemertidae Coe, 1940 (unaccepted > nomen nudum)
25. Family Sacconemertidae Iwata, 1972 accepted as Sacconemertidae Chernyshev, Timoshkin & Kawakatsu, 1998 (unaccepted > nomen nudum)
26. Genus Zygotetrastemma Chernyshev, 2016 (unaccepted > nomen nudum, type species not designated)
27. Family Emeidae Diesing, 1862 represented as Prostomatidae Bürger, 1904

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