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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).

Emarginula fissura