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(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).

Size:
Up to 20 mm long.

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

Habitat:
Lower shore and sublittoral.

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

Tonicella rubra