the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [noun] > section Siphonida > integro-pallialia > family Cyprinidae > member of (2)
Any of various fossil bivalve molluscs having heart-shaped shells.
U.S. A clam or scallop, the shell of which may be used for skimming milk, etc. Esp. the black clam, Cyprina islandica