1. Subfamily Baseodiscinae Bürger, 1904
   1. Genus Baseodiscus Diesing, 1850
   2. Genus Cephalomastax Iwata, 1957
2. Genus Oligodendrorhynchus Fernández-Álvarez & Anadón, 2012
3. Subfamily Oxypolellinae Chernyshev, 1995
   1. Genus Oxypolella Bergendal, 1902
   2. Genus Oxypolia Punnett, 1901
   3. Genus Sonnenemertes Chernyshev, Abukawa & Kajihara, 2015
4. Genus Parapolia Coe, 1895
5. Subfamily Valenciniinae Hubrecht, 1879
   1. Genus Valencinia Quatrefages, 1846
   2. Genus Valencinina Gibson, 1981
   3. Genus Valencinura Bergendal, 1902
6. Genus Balanocephalus Kennel, 1891 accepted as Baseodiscus Diesing, 1850 (synonym)
7. Genus Eupolia Hubrecht, 1887 accepted as Baseodiscus Diesing, 1850 (Synonym)
8. Genus Joubinia Bürger, 1895 accepted as Valencinia Quatrefages, 1846 (unaccepted > junior subjective synonym)
9. Genus Nematodemus von Graff, 1896 accepted as Baseodiscus Diesing, 1850 (unaccepted > junior subjective synonym)
10. Subfamily Paralineinae Chernyshev, 1995 accepted as Paralineidae Chernyshev, 1995, stat. emend. Chernyshev, 1999 accepted as Lineidae McIntosh, 1874 (unaccepted > superseded rank)
11. Genus Quatrefagea Diesing, 1862 accepted as Valencinia Quatrefages, 1846 (unaccepted > junior subjective synonym)
12. Genus Taeniosoma Stimpson, 1857 accepted as Baseodiscus Diesing, 1850 (unaccepted > junior subjective synonym)
13. Genus Valencia (Quatrefages, 1846) sensu Koehler, 1885 accepted as Valencinia Quatrefages, 1846 (unaccepted > misspelling - incorrect subsequent spelling)
14. Genus Valenciennesia Joubin, 1894 accepted as Valencinia Quatrefages, 1846 (unaccepted > unjustified emendation)

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