Marine bivalve mollusc, with a shell up to 12 cm in length. Shell is rounded and very variable, compressed and thick. Unequal valves, rough-touch and greenish brown on the outside, smooth and white pearly on the inside. It lives attached to the rocks.
- Area 21: the Northwestern part of the Atlantic Ocean
- Area 27: the Northeastern part of the Atlantic Ocean
- Area 37: the Mediterranean Sea and the Black Sea
- Area 67: the Northeastern part of the Pacific Ocean
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