#oyster  marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters
  supertype:  #bivalve__lamellibranch  marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together
  part:  #huitre
  member of:  #family_Ostreidae
  subtype:  #seed_oyster  a young oyster especially of a size for transplantation
  subtype:  #bluepoint__blue_point  small edible oyster typically from the south shore of Long Island
  subtype:  #Japanese_oyster__Ostrea_gigas  large native of Japan introduced along United States Pacific coast; candidate for introduction in Chesapeake Bay
  subtype:  #Virginia_oyster  common edible oyster of Atlantic coast of North America
  subtype:  #pearl_oyster__pearloyster__Pinctada_margaritifera  tropical marine bivalve found chiefly off eastern Asia and Pacific coast of North and Central America; a major source of pearls
  subtype:  #saddle_oyster__Anomia_ephippium  thin-shelled bivalve having the right valve deeply notched
  subtype:  #window_oyster__windowpane_oyster__capiz__Placuna_placenta  marine bivalve common in Philippine coastal waters characterized by a large thin flat translucent shell

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