Hyotissa Stenzel, 1971

Lam, Katherine & Morton, Brian, 2004, The Oysters Of Hong Kong (Bivalvia: Ostreidae And Gryphaeidae), Raffles Bulletin of Zoology 52 (1), pp. 11-28 : 24

Hyotissa Stenzel, 1971

Hyotissa Stenzel, 1971 : N1107-N1108; Torigoe, 1981: 300, 320- 321; Harry, 1985: 130.

Type species. – Mytilus hyotis Linnaeus, 1758: 704 , no. 207, by original designation.

Description. – Shell size medium to large (up to ~ 28 cm in height). Both valves tend to be subequal and similar in sculpture. Shell shape suborbicular to oval. The left valve has a large attachment area and is more convex than the right. Commissural plications originate from dichotomous radial ribs, the tops of which are crossed by growth squamae that give rise to hyote spines. Vermiculate, fingerprint-like chomata restricted to a short length along the posterior and anterior margins next to the hinge. Distortion of shell shape and sculpture due to shape and size of settling substrata is common.