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(Gmelin, 1791)

Description (shell):
Broadly oval, about one and a half times long as wide. With distinct keel and small posterior beaks. Sculpture of fine granules, becoming coarser towards margins and accentuating growth lines. Edges of plates finely denticulate; articulamentum semi-elliptical, with smooth edge. Girdle relatively narrow, covered with overlapping, elongate rectangular scales, each with distinct longitudinal striations; fringed with delicate marginal spines (L. asellus-detail).

Up to 18 mm, rarely larger.

Shell valves off-white or yellow, often with black or brownish organic incrustations.

Lower shore and sublittoral.

Widespread and common (Distr. L. asellus).

Leptochiton asellus