the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [noun] > section Asiphonida > family Ostreidae > fossil of genus Gryphoea (3)
a fossil oyster of the genus Gryphaea (presumably so named in allusion to the use of powdered oyster shell as a remedy for ague).
an oyster of the extinct Mesozoic genus Gryphaea (family Gryphaeidae), in which the mollusc occupied a distinctive large, curved left valve with…