[class in the order Mullusca; characterized by possessing two shells secreted by a mantle that extends in a sheet on either side of the body; possess two ctenida (in most cases) and a muscular foot; most bivalves are filter feeders, but some are scavengers or even predators; includes organisms such as clams, oysters, mussels, and scallops. ( CSP )]
UMLS (CSP) C0542270 Relation/PAR: Mollusca