mollusk family - a family of mollusks

Bivalvia, class Bivalvia, class Lamellibranchia, class Pelecypoda, Lamellibranchia - oysters; clams; scallops; mussels

oyster - marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters

genus Ostrea, Ostrea - type genus of the family Ostreidae

Crassostrea, genus Crassostrea - Virginia oysters