Overview

Ostreina


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; class Bivalvia, order Pterioda)

A suborder of epifaunal, cemented or free-living bivalves in which the adults are non-byssate, and the foot is absent. The shell is composed of foliated calcite with an aragonitic area below the adductor muscle. In most cases oysters live cemented to a hard substrate by the left valve, in a pleurothetic attitude. They have a monomyarian musculature; the ligament is alivincular and divided into three parts, the central section being the resilium. The hinge margin is edentulous. The gills are eulamellibranchiate, and the pallial line lacks a sinus. Oysters first appeared in the Late Triassic.

Subjects: Zoology and Animal Sciences.


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