Musculus costulatus (Risso, 1826)
British Isles to Mediterranean. Attached to rocks, stones and algae, from the low intertidal to upper circalittoral.
Original taxon: Modiolus costulatus.
Washed ashore, attached to a branch, Mimice, Omiš, Split-Dalmatia comitat, S. Croatia. 11mm. Original pictures provided by N. Lete (HR) – (CC BY-NC-SA).
Juvenile from the shore, Anse Bernardi, Port-Vendres, Eastern Pyrenees, S. France. 3,6mm.
Modiolus costulatus in A. Risso: Histoire naturelle… vol. IV, Paris 1826, via BHL.
 
« Shell smooth, shiny, quite thin, of a bland greenish mottled with reddish, anteriorly and posteriorly carved with nodulous radial striae; interspaces smooth and flat. In coralligen. »
El Forat (al Fourat), Paulilles, Port-Vendres. 3,7-5,5mm.
Cap Ras, Llançà, Girona, Catalunya, NE. Spain. 7mm.

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