An animal (such as a clam) that has a two-valved shell where both valves are the same size and shape. Also called Pelecypods.

A large group (class) of marine and freshwater molluscs with a shell in two parts hinged together (eg. mussels, clams, oysters).

a general term for two-shelled marine animals, a mollusc. Present day examples include cockles, mussels and oysters.

The clams, mussels and other mollusks. They have a two-valved shell, filtering gills and shovel-like foot.

Animals from the Phylum Mollusca, Class Bivalvia. They usually have a hinged two-part shell. Examples include mussels, clams and oysters.

An animal (as a clam or oyster) with a 2-valved shell.

Any mollusk, such as an oyster or clam, that has a shell with two hinged "valves" or shell halves.