1. Subfamily Onchidellinae Labbé, 1934
   1. Genus Onchidella J. E. Gray, 1850
   2. Genus Hoffmannola Strand, 1932 accepted as Onchidella (Hoffmannola) Strand, 1932 represented as Onchidella J. E. Gray, 1850 (unaccepted > superseded rank)
   3. Genus Occidentella Hoffmann, 1929 accepted as Onchidella J. E. Gray, 1850
   4. Genus Oncidiella P. Fischer & Crosse, 1878 accepted as Onchidella J. E. Gray, 1850 (Invalid: unjustified emendation of Onchidella)
   5. Genus Peroniella Starobogatov, 1976 accepted as Onchidella J. E. Gray, 1850
   6. Genus Watsoniella Hoffmann, 1928 accepted as Onchidella J. E. Gray, 1850 (Invalid: junior homonym of Watsoniella Berg, 1898 [Lepidoptera]; Hoffmannola is a replacement name)
2. Subfamily Onchidiinae Rafinesque, 1815
   1. Genus Alionchis Goulding & Dayrat, 2018
   2. Genus Laspionchis Dayrat & Goulding, 2019
   3. Genus Marmaronchis Dayrat & Goulding, 2018
   4. Genus Melayonchis Dayrat & Goulding, 2017
   5. Genus Onchidina C. Semper, 1882
   6. Genus Onchidium Buchannan, 1800
   7. Genus Paromoionchis Dayrat & Goulding, 2019
   8. Genus Peronia J. Fleming, 1822
   9. Genus Peronina Plate, 1893
   10. Genus Platevindex H. B. Baker, 1938
   11. Genus Semperoncis Starobogatov, 1976
   12. Genus Wallaconchis Goulding & Dayrat, 2018
   13. Genus Elophilus Labbé, 1935 accepted as Onchidium Buchannan, 1800 (invalid: junior homonym of Elophilus Meigen, 1803 [Diptera]; Labbella is a replacement name)
   14. Genus Eudrastus Gistel, 1848 accepted as Peronia J. Fleming, 1822
   15. Genus Labbella Starobogatov, 1970 accepted as Onchidium Buchannan, 1800 (unaccepted > junior subjective synonym)
   16. Genus Lessonia Labbé, 1934 accepted as Lessonina Starobogatov, 1976 accepted as Peronia J. Fleming, 1822 (Invalid: junior homonym of Lessonia Swainson, 1832 [Aves]; Lessonina is a replacement name)
   17. Genus Lessonina Starobogatov, 1976 accepted as Peronia J. Fleming, 1822 (unaccepted > junior subjective synonym)
   18. Genus Onchis A. Férussac, 1822 accepted as Peronia J. Fleming, 1822 (Nomen oblitum)
   19. Genus Oncidina Plate, 1893 accepted as Onchidina C. Semper, 1882 (unaccepted > unjustified emendation)
   20. Genus Oncidium [sic] accepted as Onchidium Buchannan, 1800 (incorrect subsequent spelling by Agassiz (1846))
   21. Genus Oncis Plate, 1893 accepted as Platevindex H. B. Baker, 1938 (invalid: junior homonym of Oncis Herrmannsen, 1847)
   22. Genus Paraoncidium Starobogatov, 1976 accepted as Onchidina C. Semper, 1882
   23. Genus Paraperonia Starobogatov, 1976 accepted as Peronia J. Fleming, 1822 (unaccepted > junior subjective synonym)
   24. Genus Quoya Labbé, 1934 accepted as Peronia J. Fleming, 1822
   25. Genus Quoyella Starobogatov, 1976 accepted as Peronia J. Fleming, 1822 (unnecessary replacement name for Quoya Labbé, 1934, by Starobogatov treated as a junior homonym of "Quoya Deshayes, 1843"; the latter is in fact an incorrect subsequent spelling of Quoyia Gray, 1839 [Planaxidae])
   26. Genus Scaphis Starobogatov, 1976 accepted as Peronia J. Fleming, 1822 (junior synonym)
   27. Genus Semperella Labbé, 1934 accepted as Semperoncis Starobogatov, 1976
3. Genus Orchidium [sic] accepted as Onchidium Buchannan, 1800 (misspelling of original genus name, Onchidium Buchannan, 1800)

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