Retusa minutissima (Monterosato, 1878)
Central Mediterranean to Guinea.
Predator in the infralittoral and the circalittoral.
Original taxon: Utriculus minutissimus.
 
The shell can bear a very variable top, « with a spire ranging from protruding to sunken within an apical umbilicus » (Crocetta & Tringali, 2015, after Oliveiro & Tringali, 2001). Monterosato notes: « apice depresso » about Jeffrey’s Utriculus obtusus var. “minor”, from which he extracts the present species. A typical feature, in association with the stocky shape and the small size, is the median constriction of the last whorl.

Beached, Leucate, Occitania, S. France. 1,2mm.
Original pictures provided by S. Clanzig (FR).
(CC BY-NC-SA) –

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