1. Family Lineidae McIntosh, 1874
2. Family Poliopsidae Gibson, 1982
3. Genus Pseudobaseodiscus Senz, 1993
4. Family Valenciniidae Hubrecht, 1879
5. Family Baseodiscidae Bürger, 1904 accepted as Valenciniidae Hubrecht, 1879 (unaccepted > superseded rank)
6. Genus Bennettia Gibson, 1981 accepted as Bennettiella Gibson, 1982 (Homonym)
7. Family Borlasiea Diesing, 1862 accepted as Borlasiidae Diesing, 1862 accepted as Lineidae McIntosh, 1874 (unaccepted > misspelling - incorrect original spelling)
8. Family Borlasiidae Diesing, 1862 accepted as Lineidae McIntosh, 1874 (unaccepted > nomen oblitum)
9. Family Cephalomastaxidae Iwata, 1972 (unaccepted > nomen nudum)
10. Family Cerebratulidae Gibson, 1985 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
11. Family Epithetosomatidae Danielssen & Koren, 1880 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
12. Family Eupoliadae Bürger, 1892 accepted as Valenciniidae Hubrecht, 1879 (Junior synonym)
13. Family Eupolidae Bürger, 1895 accepted as Valenciniidae Hubrecht, 1879 (Junior synonym)
14. Family Eupoliidae Hubrecht, 1887 accepted as Valenciniidae Hubrecht, 1879 (Junior synonym)
15. Family Gorgonorhynchidae Gibson, 1985 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
16. Family Hinumanemertidae Iwata, 1972 accepted as Lineidae McIntosh, 1874 (unaccepted > nomen nudum)
17. Family Micruraea Ehrenberg, 1831 accepted as Micruridae Ehrenberg, 1831 accepted as Lineidae McIntosh, 1874 (unaccepted > misspelling - incorrect original spelling)
18. Family Micruridae Ehrenberg, 1831 accepted as Lineidae McIntosh, 1874
19. Family Mixolineidae Gibson, 1985 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
20. Family Nemertidae Ehrenberg, 1831 accepted as Lineidae McIntosh, 1874 (unaccepted > nomen oblitum)
21. Family Panorhynchidae Gibson, 1985 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
22. Family Paralineidae Chernyshev, 1995, stat. emend. Chernyshev, 1999 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
23. Family Poliaidae Hubrecht, 1879 accepted as Valenciniidae Hubrecht, 1879 (Junior synonym?)
24. Family Polybrachiorhynchidae Gibson, 1985 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
25. Family Polybranchiorhynchidae accepted as Lineidae McIntosh, 1874 (unaccepted > misspelling - incorrect subsequent spelling)
26. Genus Pseudobasedodiscus Senz, 1992 accepted as Pseudobaseodiscus Senz, 1993 (Nomen nudum)
27. Family Pussylineidae Gibson, 1982 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
28. Family Riseriellidae Tholleson & Norenburg, 2003 accepted as Riseriidae Chernyshev, 1995, stat. emend. Chernyshev, 1999 accepted as Lineidae McIntosh, 1874 (unaccepted > misspelling - incorrect subsequent spelling, incorrect spelling of Riseriidae)
29. Family Riseriidae Chernyshev, 1995, stat. emend. Chernyshev, 1999 accepted as Lineidae McIntosh, 1874 (unaccepted > junior subjective synonym)
30. Family Taeniosomidae Sumner, Osburn & Cole, 1913 accepted as Baseodiscinae Bürger, 1904 (unaccepted > junior subjective synonym)
31. Family Uchidanidae Iwata, 1972 accepted as Lineidae McIntosh, 1874 (unaccepted > nomen nudum)
32. Family Valenciniaidae Hubrecht, 1879 accepted as Valenciniidae Hubrecht, 1879 (unaccepted > misspelling - incorrect original spelling)
33. Family Valencinidae Hubrecht, 1879 accepted as Valenciniidae Hubrecht, 1879 (unaccepted > misspelling - incorrect subsequent spelling)
34. Genus Hemicyclia Ehrenberg, 1831 (uncertain > taxon inquirendum, Questionably a Heteronemertea)
35. Genus Pseudonematon Hubrecht, 1883 (uncertain > nomen dubium)

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