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Organism
  Animalia
      Mollusca
            Gastropoda
              Prosobranchia
                    Cephalaspidea
                            Retusidae
                                     Retusa
                                             Retusa sulcata
                                     Rhizorus
                                             Rhizorus acutus
                                             Rhizorus oxytatus
                                     Sulcoretusa
                                             Sulcoretusa paziana