Marine bivalve mollusc. Solid shell, globose, with elongated contour, asymmetrical, with radial ribs and streaks of growth more marked than in Cerastoderma edule. Thick surface, somewhat rough touch. Inner border of valves is dentate. Brown color, darker than in Cerastoderma edule. Up to 3.5 cm in length.
- Area 27: the Northeastern part of the Atlantic Ocean
- Area 37: the Mediterranean Sea and the Black Sea