#pearly-shelled_mussel  the pearly lining of the dark shells is a source of mother-of-pearl
  supertype:  freshwater_mussel__freshwater_clam  bivalve mollusk abundant in rivers of central United States
  member of:  genus_Unio__Unio  type genus of the family Unionidae
     member of:  family_Unionidae__Unionidae  freshwater mussels found worldwide
        member of:  class_Bivalvia__Bivalvia__Lamellibranchia__class_Lamellibranchia__class_Pelecypoda  oysters; clams; scallops; mussels
           member of:  phylum_Mollusca__Mollusca  gastropods; bivalves; cephalopods; chitons
              member of:  kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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