ark shell

English Thesaurus

1. marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface (noun.animal)

hypernym	:	bivalve, lamellibranch, pelecypod,
definition	:	marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together (noun.animal)

member meronym	:	arca, genus arca,
definition	:	type genus of the family Arcidae: ark shells and blood clams (noun.animal)