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(Alder, 1848)

Description (shell):
Shell small, transparent, smooth, fragile; four-and-one-half tumid whorls, slightly stepped at sutures; apex blunt. Last whorl about 70 % of shell height. Sculpture of prosocline growth lines. Aperture egg-shaped; inner lip slightly reflected over small umbilical chink.

Size:
Up to 1.5 x 0.9 mm.

Colour:
Milk-white.

Animal:
Snout deeply bifid, appearance tentaculate; cephalic tentacles cylindrical, finely setose. Mantle edge without pallial tentacles. Foot with anterior pedal gland opening dorsally and posterior gland opening ventrally, latter linked by a groove to posterior margin of sole. Colour: cream with some darker patches. Operculum horny, nucleus close to columellar margin.

Habitat:
Common in summer among filamentous red algae and in coralline rock-pools between MTL and LWST.

Distribution:
Distributed from Mediterranean to Norway; absent from Baltic and most of North Sea (Distr. R. diaphana).

Rissoella diaphana