Knapp in Murray, 1857
Description (shell):
Shell like that of Patella ulyssiponensis in shape and sculpture, usually smaller and narrower anteriorly; a flattened cone (apical angle approx. 120°) with fine radiating ribs (P. intermedia-drawing).
Size:
Up to 30 x 25 x 12 mm.
Colour:
Distinctive orange-brown marginal rays on inner surface, the central part yellow.
Animal:
Foot dark olive or black, pallial tentacles chalky white; body otherwise similar to Patella vulgata .
Habitat:
On exposed rocky shores only, from MHWN to MLWN, prefers vertical surfaces.
Distribution:
A Mediterranean species reaching its northern limit on shores of south-west England and Wales; rare on west coast of Ireland. Probably not in the North Sea.