Shell slightly inequivalve, strongly inequilateral. Outline variable, resembling a spathule. The not well developed wings, the posterior one being obsolete, and an elongate dorso-ventrally curved but irregular shell, are diagnostic of the species. Ventral margin often sinuous, occasionally expanded; Ligament in a single triangular pit. Internal shell nacrous.
color pattern variable, brown-purple throughout to greyish-yellow with purple brown spots to greyish yellow.
common size :
shell to 70 mm in height.
The spathulate shape often irregular and distorted and the lack of prominent wings distinguish it from other congeneric species.
BIOLOGY / ECOLOGY
at depths 1.5-59 m, in rock crevices or under stones. Attached by byssus among rocks, stones and coral debris.