Dosinia exoleta

(Linné, 1758)

Description (shell);
Shell almost circular; inequilateral, umbones small but distinct, just anterior to midline. Dorsal margin gently convex posteriorly, deeply concave immediately anterior to umbones, with a highly arched junction with anterior margin. Lunule heart-shaped, as broad as long; escutcheon poorly defined. Sculpture of numerous fine concentric ridges, surface smooth to touch. Growth stages clear. Three cardinal teeth in each valve; a short, rounded knob in front of the interior teeth of the left valve engages in a shallow pit in the right. Adductor scars and pallial line distinct, pallial sinus deep, narrow, U-shaped, extending anterio-dorsally well into the anterior half of the shell (D. exoleta).

Up to 60 mm long.

White, yellowish, or light brown, with irregular rays, streaks, or blotches of darker brown or pinkish brown. Inner surfaces glossy white.

Pale yellowish, the mantle fringed with white lashes. The siphons are short and united. The large foot is white and axe-shaped.

Burrowing in muddy gravel or shell-gravel, from the lower shore to about 100 m.

Distributed from Norway to the Mediterranean and West Africa (Distr. D. exoleta).