[phylum of the kingdom Metazoa; organisms have soft, unsegmented bodies with an anterior head, a dorsal visceral mass, and a ventral foot; most are encased in a protective calcareous shell; includes the classes Gastropoda, Bivalvia, Cephalopoda, Aplacophora, Scaphopoda, Polyplacophora, and Monoplacophora. ( CSP )]
UMLS (CSP) C0026391 Relation/PAR: Invertebrates
Relation/CHD: Gastropoda
Cephalopoda
bivalve