1. Family Aberrantidae Wolf, 1987
2. Family Apharyngtidae Worsaae, Kerbl, Di Domenico, Gonzalez, Bekkouche & Martínez, 2021
3. Family Dinophilidae Macalister, 1876
4. Family Histriobdellidae Claus & Moquin-Tandon, 1884
5. Family Laetmonectidae Buzhinskaja, 1986
6. Family Magelonidae Cunningham & Ramage, 1888
7. Family Nerillidae Levinsen, 1883
8. Family Oweniidae Rioja, 1917
9. Family Parergodrilidae Reisinger, 1925
10. Family Polygordiidae Czerniavsky, 1881
11. Family Protodrilidae Hatschek, 1888
12. Family Protodriloididae Purschke & Jouin, 1988
13. Family Psammodrilidae Swedmark, 1952
14. Genus Pseudocirratulus Augener, 1922
15. Family Saccocirridae Bobretzky, 1872
16. Family Spintheridae Augener, 1913
17. Family Ammocharidae Malmgren, 1867 accepted as Oweniidae Rioja, 1917 (replaced by prevailing usage, although senior to Oweniidae)
18. Genus Dorsibranchus Wagner, 1885 (unaccepted > nomen nudum, unavailable as no description)
19. Genus Grapsobranchus Wagner, 1885 (unaccepted > nomen nudum, unavailable as no description)
20. Family Maeadae Johnston, 1865 accepted as Magelonidae Cunningham & Ramage, 1888 (proposed, available, but never adopted)
21. Genus Solen [Klein, 1731, pre-Linnaean, Not Solen Linnaeus, 1758] (unaccepted > nomen nudum, pre-Linnaean usage, here for an annelid binominal, not a mollusc)
22. Genus Anatomus Montfort, 1810 (uncertain > nomen dubium, Described as Mollusca. Indeterminable whether Mollusca or Polychaeta)
23. Order Archiannelida (uncertain > nomen dubium, Superfluous name)
24. Genus Aricinella Quatrefages, 1844 (uncertain > nomen dubium)
25. Family Kalaminochaetidae Nolte, 1941 (uncertain > nomen dubium, erected for indeterminable larval forms)
26. Genus Lumbricus auctorum [non Lumbricus Linnaeus, 1758] (uncertain > nomen dubium, non Clitellata)
27. Infraorder Oweniida (uncertain > nomen dubium, Superfluous name)
28. Family Protodrilidae Czerniavsky, 1881 (uncertain > nomen dubium, based on a homonym of uncertain priority)
29. Order Psammodrilida (uncertain > nomen dubium, Superfluous name)
30. Order Spintherida (uncertain > nomen dubium, Superfluous name)
31. Genus Tubularia [Auct. Non sensu Linnaeus, 1758] (uncertain > taxon inquirendum, Duplicate to Tubularia Linnaeus for editing of Sabellida Annelida originally named in "Tubularia" (Hydrozoa))

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