(Linné, 1758)
Description (shell):
Shell strongly reticulate, conical, oval in plan view. Apex about one-third of shell length behind anterior margin, perforated by a single oval opening, with somewhat flared posterior lip (D. graeca-drawing).
Size:
Up to 25 x 16 x 10 mm.
Colour:
White, with radiating bands of brown or green.
Animal:
Foot oval, straight-sided, with 30-35 epipodial tentacles at base; inner lamella of mantle forming thick papillose skirt which hangs below margin of shell. Body cream coloured, deep orange or red.
Habitat:
Under boulders and overhangs on rocky shores from LWST to 250 m.
Distribution:
Distributed from Faroes to the Canary Islands. Absent from west coast of Norway, North Sea coasts of England and eastern parts of Channel (Distr. D. graeca).