#bivalve__lamellibranch  marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together
  supertype:  #mollusk__mollusc__shellfish  invertebrate having a soft unsegmented body usually enclosed in a shell
  member of:  #class_Bivalvia
  subtype:  #clam  burrowing marine mollusk living on sand or mud
     subtype:  #Mya_arenaria__soft-shell_clam__steamer__steamerclam__long-neck_clam  an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe
     subtype:  #Venus_mercenaria__quahog__quahaug__hard-shell_clam__round_clam__roundclam__Mercenaria_mercenaria  an edible American clam
        subtype:  #littleneck_clam__littleneck  a young quahog suitable to be eaten raw
        subtype:  #cherrystone_clam__cherrystoneclam__cherrystone  a half-grown quahog
     subtype:  #geoduck  a large edible clam found burrowing deeply in sandy mud along the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the shell
     subtype:  #razor_clam__razorclam__jackknife_clam__jackknifeclam__knife-handle__knifehandle  marine clam having a long narrow curved thin shell
     subtype:  #giant_clam__giantclam__Tridacna_gigas  giant clam inhabiting reefs in the South Pacific weighing up to 500' pounds
     subtype:  #shipworm__teredinid  wormlike marine bivalve that bores into wooden piers and ships by means of drill-like shells
        subtype:  #teredo  typical shipworm
        subtype:  #giant_northwest_shipworm__giantnorthwestshipworm__Bankia_setaceae  giant shipworm of the Pacific coast of North America
  subtype:  #cockle  common edible European bivalve mollusk having a rounded shell with radiating ribs
     subtype:  #edible_cockle__Cardium_edule  common edible European cockle
  subtype:  #oyster  marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters
     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
  subtype:  #ark_shell__arkshell  marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface
  subtype:  #blood_clam__bloodclam  red-blooded clam
  subtype:  #mussel  marine or freshwater bivalve mollusk that lives attached to rocks etc.
     subtype:  #marine_mussel__mytilid  marine bivalve mollusk having a dark elongated shell; live attached to solid objects especially in intertidal zones
        subtype:  #edible_mussel__Mytilus_edulis  dark-shelled edible mussel that lives attached to rocks
     subtype:  #freshwater_mussel__freshwater_clam  bivalve mollusk abundant in rivers of central United States
        subtype:  #pearly-shelled_mussel  the pearly lining of the dark shells is a source of mother-of-pearl
        subtype:  #thin-shelled_mussel  mussel with thin fragile shells having only rudimentary hinge teeth
        subtype:  #zebra_mussel__zebramussel__Dreissena_polymorpha  inch-long mollusk imported accidentally from Europe; clogs utility inlet pipes and feeds on edible freshwater mussels
  subtype:  #scallop__scollop__escallop  edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions
     subtype:  #Pecten_irradians__bay_scallop  small scallop inhabiting shallow waters and mud flats of the North American Atlantic coast
     subtype:  #giant_scallop__giantscallop__sea_scallop__seascallop__Pecten_magellanicus  large scallop inhabiting deep waters of the North American Atlantic coast
  subtype:  #piddock  marine bivalve that bores into rock or clay or wood by means of saw-like shells

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