1. Subfamily Acanthochitoninae Simroth, 1894 (1881)
   1. Genus Acanthochitona J. E. Gray, 1821
   2. Genus Americhiton Watters, 1990
   3. Genus Bassethullia Pilsbry, 1928
   4. Genus Choneplax P. P. Carpenter, 1882
   5. Genus Craspedochiton Shuttleworth, 1853
   6. Genus Craspedoplax Iredale & Hull, 1925
   7. Genus Cryptoconchus Burrow, 1815
   8. Genus Leptoplax Dall, 1882
   9. Genus Notoplax H. Adams, 1862
   10. Genus Pseudotonicia Ashby, 1928
   11. Genus Acanthochaetes Risso, 1826 accepted as Acanthochitona J. E. Gray, 1821 (synonym and incorrect subsequent spelling of Acanthochites Risso, 1826)
   12. Genus Acanthochites Risso, 1826 accepted as Acanthochitona J. E. Gray, 1821 (unaccepted > junior subjective synonym)
   13. Genus Acanthochiton Herrmannsen, 1846 accepted as Acanthochitona J. E. Gray, 1821 (invalid: unjustified emendation of Acanthochites Risso, 1826)
   14. Genus Acantochiton [sic] accepted as Acanthochiton Herrmannsen, 1846 accepted as Acanthochitona J. E. Gray, 1821 (unaccepted > misspelling - incorrect subsequent spelling)
   15. Genus Angasia P. P. Carpenter, 1882 accepted as Craspedochiton Shuttleworth, 1853
   16. Genus Anisochiton P. Fischer, 1885 accepted as Acanthochitona J. E. Gray, 1821 (synonym)
   17. Genus Aristochiton Thiele, 1909 accepted as Notoplax H. Adams, 1862 (unaccepted > junior subjective synonym)
   18. Genus Chitonellus Lamarck, 1819 accepted as Cryptoplax Blainville, 1818 (unaccepted > junior subjective synonym)
   19. Genus Glyptelasma Iredale & Hull, 1925 accepted as Bassethullia Pilsbry, 1928
   20. Genus Loboplax Pilsbry, 1893 accepted as Notoplax H. Adams, 1862 (synonym)
   21. Genus Lophoplax Ashby, 1926 accepted as Notoplax H. Adams, 1862
   22. Genus Macandrellus Dall, 1879 accepted as Notoplax H. Adams, 1862 (synonym)
   23. Genus Mecynoplax Thiele, 1893 accepted as Notoplax H. Adams, 1862 (unaccepted > junior subjective synonym)
   24. Genus Meturoplax Pilsbry, 1894 accepted as Acanthochitona J. E. Gray, 1821
   25. Genus Phacellozona Pilsbry, 1894 accepted as Craspedochiton Shuttleworth, 1853
   26. Genus Spongiochiton P. P. Carpenter, 1882 accepted as Craspedochiton Shuttleworth, 1853 (unaccepted > junior subjective synonym)
   27. Genus Thaumastochiton Thiele, 1909 accepted as Craspedochiton Shuttleworth, 1853
2. Subfamily Cryptochitoninae Pilsbry, 1893
   1. Genus Cryptochiton Middendorff, 1847
3. Genus Sulcichiton Sirenko, 2021
4. Subfamily Afossochitoninae Ashby, 1925 accepted as Acanthochitonidae Simroth, 1894 (1881)
5. Genus Amblyplax Ashby, 1926 accepted as Notoplax H. Adams, 1862

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