
Genus Acanthochiton Gray em. 1821.
Having 5 slits in insertion-plate of anterior valve, 2 slits in tailvalve, teeth sharp, sutural hair-tufts in girdle.

Acanthochiton zelandicus.
Chiton zealandicus Quoy and Gaimard, 1835, Voy. Astrol., vol. 3, p. 400, pl. 73, figs. 5–8.
Acanthochites zealandicus Pilsbry, Man. Conch. vol. 15, p. 16, pl. 14, figs. 9–10; Proc. Mal. Soc. Lon., 2, p. 192.
Acanthochites hookeri in Dieff. N.Zd. 2, 262.
Acanthochites spiculosus var. astringa Wissel, Zool. Jahrb. Systs. vol. 20, p. 612, pl. 21, fig. 25, pl. 23, figs. 28–29 (anatomy), not of Reeve.
Acanthochites (Acanthochiton) bisulcatus Wissel, op. cit. p. 614, pl. 21, figs. 28–29 (anatomy). Note French Pass examples only, not of Pilsbry.
Acanthochites zealandicus Thiele, Rev. des Syst. der Chitonen, pt. 1, p. 50, pl. 6, figs. 51–52.
Acanthochiton zealandicus Iredale, Trans. N.Z. Inst. vol. 47, p. 425, 1915.
Type from French Pass, in Mus. d'Hist. Nat. Paris.
Acanthochiton doubtlessensis.
Acanthochiton zealandicus doubtlessensis Ashby. “The Acanthoid Chitons of N.Z” (l.c.). Type from Doubtless Bay.
Acanthochiton thileniusi.
Acanthochites thileniusi Thiele (l.c.) pp. 50–51, pl. 6, figs. 55–58, 1900.
Acanthochites tristis Iredale, Proc. Mal. Soc. Lon. vol. 9, p. 155, not of Rochebrune.
Acanthochites (Acanthochiton) bisulcatus Wissel (l.c.), not of Pilsbry. (Only applies to examples from Tauranga.)
Acanthochiton zealandicus thileniusi Ashby, “The Acanthoid Chitons of N.Z.” (l.c.). Type from Tauranga Harbour in Mus. d'Hist. Nat. Paris.
Acanthochiton brookesi.
Acanthochiton brookesi, Ashby, “The Acanthoid Chitons of N.Z.” (l.c.) Type believed to be from Auckland Harbour; presented to Auckland Museum.
