1. Subgenus Acanthochiton (Acanthochites) Risso, 1826 accepted as Acanthochitona J. E. Gray, 1821
   1. Species Acanthochiton (Acanthochites) discrepans (T. Brown, 1827) accepted as Acanthochitona discrepans (T. Brown, 1827)
2. Subgenus Acanthochiton (Eoplax) Ashby & Cotton, 1936 † accepted as Notoplax H. Adams, 1862
   1. Species Acanthochiton (Eoplax) adelaidae Ashby & Cotton, 1936 † accepted as Notoplax adelaidae (Ashby & Cotton, 1936) †
3. Subgenus Acanthochiton (Lirachiton) Ashby & Cotton, 1939 accepted as Lirachiton Ashby & Cotton, 1939 †
   1. Species Acanthochiton (Lirachiton) inexpectus Ashby & Cotton, 1939 † accepted as Lirachiton inexpectus (Ashby & Cotton, 1939) †
4. Subgenus Acanthochiton (Loboplax) Pilsbry, 1893 accepted as Notoplax H. Adams, 1862
   1. Species Acanthochiton (Loboplax) stewartiana (Thiele, 1909) accepted as Notoplax mariae (W. H. Webster, 1908) (junior subjective synonym)
5. Subgenus Acanthochiton (Notoplax) H. Adams, 1862 accepted as Notoplax H. Adams, 1862
   1. Species Acanthochiton (Notoplax) gabrieli Ashby, 1922 accepted as Notoplax gabrieli (Ashby, 1922) (original combination)
   2. Species Acanthochiton (Notoplax) porcina Ashby, 1919 accepted as Bassethullia porcina (Ashby, 1919) (original combination)
   3. Species Acanthochiton (Notoplax) quincunx Leloup, 1981 accepted as Acanthochitona quincunx Leloup, 1981 (unaccepted > superseded combination)
   4. Species Acanthochiton (Notoplax) spongialis Ashby, 1923 accepted as Notoplax speciosa (H. Adams, 1862)
6. Species Acanthochiton adansoni (Rochebrune, 1881) accepted as Acanthochitona crinita (Pennant, 1777)
7. Species Acanthochiton aenigma Iredale & Hull, 1925 accepted as Notoplax aenigma (Iredale & Hull, 1925) (original combination)
8. Species Acanthochiton ashbyi Leloup, 1937 accepted as Acanthochitona mahensis Winckworth, 1927
9. Species Acanthochiton balcombiensis Ashby, 1939 † accepted as Acanthochitona balcombiensis (Ashby, 1939) †
10. Species Acanthochiton bednalli (Pilsbry, 1894) accepted as Acanthochitona bednalli (Pilsbry, 1894)
11. Species Acanthochiton brookesi Ashby, 1926 accepted as Acanthochitona brookesi Ashby, 1926 (superseded combination)
12. Species Acanthochiton casus Ashby & Cotton, 1939 † accepted as Acanthochitona casus (Ashby & Cotton, 1939) †
13. Species Acanthochiton chapmani Ashby, 1925 † accepted as Acanthochitona chapmani (Ashby, 1925) †
14. Species Acanthochiton communis (Risso, 1826) accepted as Acanthochitona fascicularis (Linnaeus, 1767)
15. Species Acanthochiton complanatus Hull, 1924 accepted as Acanthochitona complanata (Hull, 1924) (original combination)
16. Species Acanthochiton coquimboensis Leloup, 1941 accepted as Acanthochitona hirudiniformis (G. B. Sowerby I, 1832)
17. Species Acanthochiton couthouyi Rochebrune, 1889 accepted as Hemiarthrum setulosum P. P. Carpenter, 1876 (junior subjective synonym)
18. Species Acanthochiton crocodilus (Torr & Ashby, 1898) accepted as Notoplax crocodila (Torr & Ashby, 1898)
19. Species Acanthochiton curiosus Iredale & Hull, 1925 accepted as Notoplax curiosa (Iredale & Hull, 1925) (original combination)
20. Species Acanthochiton curvisetosus Leloup, 1960 accepted as Acanthochitona curvisetosa (Leloup, 1960) accepted as Leptoplax curvisetosa (Leloup, 1960) (unaccepted > superseded combination)
21. Species Acanthochiton discrepans (T. Brown, 1827) accepted as Acanthochitona discrepans (T. Brown, 1827) (Following genus synonymy)
22. Species Acanthochiton dissimilis Is. Taki & Iw. Taki, 1931 accepted as Acanthochitona dissimilis Is. Taki & Iw. Taki, 1931
23. Species Acanthochiton drunus Ashby & Cotton, 1939 † accepted as Acanthochitona drunus (Ashby & Cotton, 1939) †
24. Species Acanthochiton fascicularis (Linnaeus, 1767) accepted as Acanthochitona fascicularis (Linnaeus, 1767) (Following genus synonymy)
25. Species Acanthochiton flebilis Laws, 1950 † accepted as Acanthochitona flebilis (Laws, 1950) † (superseded combination)
26. Species Acanthochiton forsythensis Ashby & Cotton, 1939 † accepted as Acanthochitona forsythensis (Ashby & Cotton, 1939) †
27. Species Acanthochiton foveauxensis Mestayer, 1926 accepted as Notoplax rubiginosa (F. W. Hutton, 1872) (junior subjective synonym)
28. Species Acanthochiton garnoti (Blainville, 1825) accepted as Acanthochitona garnoti (Blainville, 1825)
29. Species Acanthochiton gatliffi Ashby, 1919 accepted as Acanthochitona gatliffi (Ashby, 1919) (original combination)
30. Species Acanthochiton heterochaetus Bergenhayn, 1931 accepted as Acanthochitona fascicularis (Linnaeus, 1767) (synonym)
31. Species Acanthochiton hispidus K. van W. Palmer, 1945 accepted as Acanthochitona crinita (Pennant, 1777) (junior subjective synonym)
32. Species Acanthochiton kimberi (Torr, 1919) accepted as Acanthochitona kimberi (Torr, 1912)
33. Species Acanthochiton macrocystialis Ashby, 1924 accepted as Acanthochitona macrocystialis (Ashby, 1924) (original combination)
34. Species Acanthochiton mastalleri Strack, 1989 accepted as Acanthochitona mastalleri Strack, 1989 (basionym)
35. Species Acanthochiton maxillaris Ashby, 1919 accepted as Acanthochitona kimberi (Torr, 1912) (unaccepted > junior subjective synonym)
36. Species Acanthochiton mayi Ashby, 1922 accepted as Notoplax mayi (Ashby, 1922) (original combination)
37. Species Acanthochiton minutus Leloup, 1980 accepted as Acanthochitona minuta Leloup, 1980 (unaccepted > superseded combination)
38. Species Acanthochiton noumeaensis Leloup, 1941 accepted as Leptoplax noumeaensis (Leloup, 1941) (unaccepted > superseded combination)
39. Species Acanthochiton oblongus Leloup, 1981 accepted as Acanthochitona oblonga Leloup, 1981 (unaccepted > superseded combination)
40. Species Acanthochiton pelicanensis Mackay, 1929 accepted as Acanthochitona pelicanensis (Mackay, 1929) (original combination)
41. Species Acanthochiton penicillatus (Deshayes, 1863) accepted as Acanthochitona penicillata (Deshayes, 1863)
42. Species Acanthochiton peruvianus Leloup, 1941 accepted as Acanthochitona hirudiniformis peruviana Leloup, 1941 (superseded combination)
43. Species Acanthochiton pilsbryi (Sykes, 1896) accepted as Acanthochitona pilsbryi (Sykes, 1896)
44. Species Acanthochiton pilsbryoides Ashby & Cotton, 1939 † accepted as Acanthochitona pilsbryoides (Ashby & Cotton, 1939) †
45. Species Acanthochiton retrojectus (Pilsbry, 1894) accepted as Acanthochitona retrojecta (Pilsbry, 1894)
46. Species Acanthochiton rubrolineatus (Lischke, 1873) accepted as Acanthochitona rubrolineata (Lischke, 1873) (unaccepted > superseded combination)
47. Species Acanthochiton sabratus Ashby & Cotton, 1939 † accepted as Acanthochitona sabratus (Ashby & Cotton, 1939) †
48. Species Acanthochiton sagamicus Bergenhayn, 1933 accepted as Acanthochitona achates (A. Gould, 1859)
49. Species Acanthochiton shirleyi Ashby, 1922 accepted as Acanthochitona shirleyi (Ashby, 1922) (original combination)
50. Species Acanthochiton sphenorhynchus Iredale & Hull, 1925 accepted as Notoplax sphenorhyncha (Iredale & Hull, 1925) (original combination)
51. Species Acanthochiton stygma Rochebrune, 1889 accepted as Hemiarthrum setulosum P. P. Carpenter, 1876 (uncertain synonym)
52. Species Acanthochiton subrubicundus Leloup, 1941 accepted as Acanthochitona subrubicunda (Leloup, 1941) (unaccepted > superseded combination)
53. Species Acanthochiton thackwayi Ashby, 1924 accepted as Acanthochitona thackwayi (Ashby, 1924) (original combination)
54. Species Acanthochiton trianguloides Ashby & Cotton, 1939 † accepted as Acanthochitona trianguloides (Ashby & Cotton, 1939) †
55. Species Acanthochiton turtoni Ashby, 1928 accepted as Acanthochitona turtoni (Ashby, 1928) accepted as Acanthochitona variegata (Nierstrasz, 1906) (original combination)
56. Species Acanthochiton violaceus (Quoy & Gaimard, 1835) accepted as Notoplax violacea (Quoy & Gaimard, 1835) (superseded combination)
57. Species Acanthochiton zelandicus (Quoy & Gaimard, 1835) accepted as Acanthochitona zelandica (Quoy & Gaimard, 1835) (superseded combination)

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