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Organism
  Animalia
      Mollusca
            Gastropoda
              Heterobranchia
                Euthyneura
                 Tectipleura
                    Cephalaspidea
                          Bulloidea
                            Retusidae
                                     Retusa
                                           [Cylichnina]
                                             Retusa umbilicata
                                                   [Cylichnina umbilicata]