Central Taxonomic Thesaurus
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Organism
  Animalia
         [Metazoa]
      Mollusca
            Bivalvia
                   [Conchifera]
                   [Lamellibranchiata]
                   [Pelecypoda]
              Autobranchia
               Heteroconchia
                Heterodonta
                    Veneroida
                          Astartoidea
                            Cardiniidae