Trimusculus mammillaris (Linnaeus, 1758)
Algarve to Canarias, possibly south to the Cabo Verde archipelago; Mediterranean.
 
Suspension feeder (by mucus release) in shallow water, hidden under rocks and in narrow crevices near banks of Seashore lithophyllum, just below the surface. Gregarious and very sedentary. Original taxon: Patella mammillaris. Synonyms: depressa, lateralis, mamillata

1-2m deep, in grit, Falasarna bay, Kissamos, W. Crete. 8-9mm.
Above and below:
Washed ashore juveniles from La Franqui, Leucate, Occitania, S. France. 2,4-3,2mm.
In this species, the apex can be laterally offset. Original pictures provided by S. Clanzig (FR) – (CC BY-NC-SA).
In collection A. Bertrand.
Old specimen from 25m deep, in cave between Zaklopatica and Korčula islands, Dubrovnik-Neretva Comitat, S. Croatia. Size about 12mm. Original pictures provided by N. Lete (HR).
(CC BY-NC-SA)

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