Crisilla semistriata (Montagu, 1808)
Norway to eastern Mediterranean.
Grazer and detritus feeder from intertidal down to 100m deep. Gregarious. Can be found on brown algae such as Cystoceira tamariscifolia, or in Posidonia fields, again on brown algae, or in association with coralline algae (Mesophyllum).
Original taxon: Turbo semistriatus.
A specimen from Leucate, Occitania, S. France. 2mm.
Original pictures provided by S. Clanzig (FR) – (CC BY-NC-SA).
Synonyms: aurita, marmorata, obesa, subsulcata.
4m deep, at the base of a large granitic boulder, Cala d’Alivu, Isola Rossa, NW. Corsica. 1,75mm.
Variant “obesa”: 25m deep, in sediments, between Sapri and Acquafredda, S. Campanian border, SW. Italy. 2,2mm.
Same spot. 1,7-1,9mm.
Same spot. 2,4mm.
The species is characterized by a weakening of the spiral sculpture near the periphery of each whorl. – 8m deep, in grit, Vignola bay, Marina di Davia, Corbara, NW. Corsica. 1,8mm.
12m deep, Vouliagmeni area, Attikí, SE. Greece. 2,3mm.
A specimen travelling on an Acanthochitona crinita (Pennant, 1777) at low tide, on a rock near La Landriais, Le Minihic-sur-Rance, N. Brittany, NW. France. Original picture provided by P. Corbrion for iNaturalist – (CC BY-NC-SA).
28m deep, Čiovo island, Split-Dalmatia Comitat, S. Croatia. 2mm. Original pictures provided by P. Ugarković (HR).
(CC BY-NC-SA)
Thick adult from 26m deep, Punta de la Mona, La Herradura, Granada, Andalucia, S. Spain. 2,85mm.
Same spot. 2,55mm.
Construction of the lip in a large subadult from the same spot. 2,45mm.

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