Cryptoplax de Blainville, 1818

Sirenko, Boris I. & Saito, Hiroshi, 2017, New species of chitons of the superfamily Cryptoplacoidea (Mollusca: Polyplacophora) from Vietnamese waters, Zootaxa 4299 (4), pp. 451-506 : 495

Genus Cryptoplax de Blainville, 1818

Type species. Chiton larvaeformis de Blainville MS, Burrow, 1815, by subsequent designation (Gray 1821).

Diagnosis. Medium to large, vermiform chitons. Valves greatly reduced, often separated from each other in valves V to VIII. Tegmentum small, with usually well defined, narrow jugum; lateral and pleural areas hardly separable. Articulamentum small; sutural laminae convex in antero-lateral edge in tail valve; insertion plates usually large on head valve, short on other valves; slit formula 3/0/0. Girdle fleshy, densely spiculose; sutural tufts always present, but not prominent. Radula teeth arranged symmetrically; central tooth symmetrical (rarely asymmetrical), small, thick, concave in the distal half, keeled near base; first lateral (centro-lateral) tooth with thickened, nodulous antero-dorsal corner; major lateral tooth with tricuspid head which denticles are short and nearly equal in length (radula characters: after Saito 2004 with modification).