Tonicella rubra

(Linné, 1767)

Description (shell):
Broadly oval, about one and a half times long as wide. Shell valves smooth and glossy; gently arched, keel scarcely developed but beaks well-marked. Sculpture more distinct than in Tonicella marmoreus : very fine granulation dorsally, becoming rather pronounced marginally; growth lines conspicuous. Girdle marbled brown and white, densely covered with spherical granules, fringed with slightly flattened spines (T. rubra).

Up to 20 mm long.

Shell valves pale buff to deep chestnut-brown, richly marbled with white.

Lower shore and sublittoral.

Not in the southern North Sea (Distr. T. rubra).