Marine bivalve mollusc. Large shell (10-22 cm long), almost circular; umbones in centre, between two almost equal ears. Exterior of right valve whitish, with 20 broad, flattened ribs. Exterior of left valve purplish brown with 20 coarse radial ribs. Interior valve whitish, furrowed, with a single adductor muscle scar.
- Area 27: the Northeastern part of the Atlantic Ocean
- Area 37: the Mediterranean Sea and the Black Sea
- Area 61: the Northwestern part of the Pacific Ocean
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