Как по Английски будет schelpdier

noun

An aquatic shelled mollusc (e.g. an oyster or cockle) or crustacean (e.g. a crab or shrimp), especially one that is edible.

Примеры использования:

This species is harmful to marine shellfish

noun

The shell of a clam, formed of two roughly equal valves with a hinge.

Примеры использования:

Glue the larger shells, such as these clamshells, to the inner and outer edges of the frame.