Linné, 1758
Description (shell):
Shell solid, strongly reticulate, cap-shaped with a posteriorly directed, recurved apex (beak) of two spirally coiled whorls. A sunken slit band arising anterior to beak, perforate distally, forming a marginal exhalant slit above the mantle cavity. No operculum (E. fissura-drawing).
Size:
Up to 8 x 6 mm.
Colour:
White.
Animal:
Foot shield-shaped, broader anteriorly, with 10 epipodial tentacles on each side. An additional epipodial tentacle arises from back of head on right side.
Habitat:
From lower shore (LWST) to 265 m, on rocks and boulders bearing sponges, upon which it feeds.
Distribution:
On all suitable west European coasts from Norway and Faroe Islands to Canary Islands (Distr. E. fissura).