underside of Cryptochiton stelleri
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Polyplacophora
Order: Neoloricata
Suborder: Acanthochitonina
Family: Acanthochitonidae
Pilsbry, 1893

Acanthochitidae (basionym)

Acanthochitonidae is a family of chitons.


These small to large chitons are characterised by a broad girdle with erect tufts of up to ten large bristles. The coarsely granular valves of the shell are partially overlapped by the girdle. This girdle is all covered by coarse spines. The articulating flange, or articulamentum, is well developed. The margin of the cephalic plate has about five slits. The lateral insertion plates all have a single notch. [1]


According to the World Register of Marine Species (WoRMS) the following genera are included in this family [2]


  1. P.J. Hayward, and J.S. Ryland (1996). Handbook of the Marine Fauna of North-West Europe. Oxford University Press. p. 485. ISBN 0-19-854055-8.
  2. WoRMS : Acanthochitonidae
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