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Organism
  Animalia
         [Metazoa]
      Mollusca
            Bivalvia
                   [Conchifera]
                   [Lamellibranchiata]
                   [Pelecypoda]
              Autobranchia
               Pteriomorphia
                    Ostreida
                           [Pteriida]
                          Ostreoidea
                                 [Ostreacea]
                            Gryphaeidae
                              Exogyrinae
                                     Exogyra
                                             Exogyra conica
                                             Exogyra costata
                                     Nanogyra
                                             Nanogyra nana
                              Gryphaeinae
                                Gryphaeini
                                     Gryphaea
                                Pernostreini
                                     Deltoideum
                                     Pernostrea
                              Gryphaeostreinae
                                     Gryphaeostrea
                              Pycnodonteinae
                                     Argutostrea
                                             Argutostrea roemeri
                                     Crenostrea
                                             Crenostrea cannoni
                                             Crenostrea wuellerstorfi
                                             Crenostreagittosina
                                     Empressostrea
                                             Empressostrea kostini
                                     Hyotissa
                                             Hyotissa fisheri
                                                   [Ostrea fisheri]
                                             Hyotissa hyotis
                                                   [Pycnodonta hyotis]
                                             Hyotissa inermis
                                                   [Hyotissa imbricata]
                                                   [Parahyotissa imbricata]
                                                   [Parahyotissa inermis]
                                             Hyotissa mcgintyi
                                                   [Parahyotissa rosea]
                                             Hyotissa numisma
                                                   [Parahyotissa numisma]
                                             Hyotissa quercina
                                                   [Parahyotissa quercina]
                                             Hyotissa quercinus
                                             Hyotissa sinensis
                                                   [Ostrea sinensis]
                                     Neopycnodonte
                                             Neopycnodonte cochlear
                                                   [Ostrea cochlear]
                                                   [Ostrea hiranoi]
                                                   [Ostrea kauaia]
                                             Neopycnodonte zibrowii
                                     Parahyotissa
                                             Parahyotissa mcgintyi
                                     Pycnodonte
                                           [Pycnodonta]
                                             Pycnodonte fischeri
                                             Pycnodonte hyotis
                                                   [Ostrea thomasi]
                                             Pycnodonte kamehameha
                                             Pycnodonte lubra
                                             Pycnodonte mackayi
                                             Pycnodonte radiata
                                             Pycnodonte subdentata
                                             Pycnodonte taniguchii
                                             Pycnodonte tarda
                                     Pycnogryphaea
                                             Pycnogryphaea weberae