#family_Unionidae__Unionidae  freshwater mussels found worldwide
  supertype:  mollusk_family__molluskfamily  a family of mollusks
  member of:  class_Bivalvia
  member:  genus_Unio__Unio  type genus of the family Unionidae
     member:  pearly-shelled_mussel  the pearly lining of the dark shells is a source of mother-of-pearl
  member:  genus_Anodonta__Anodonta  thin-shelled freshwater mussels
     member:  thin-shelled_mussel  mussel with thin fragile shells having only rudimentary hinge teeth
  member:  genus_Dreissena__Dreissena  zebra mussels
     member:  zebra_mussel__zebramussel__Dreissena_polymorpha  inch-long mollusk imported accidentally from Europe; clogs utility inlet pipes and feeds on edible freshwater mussels

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