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Organism
  Animalia
      Mollusca
            Gastropoda
                    Caenogastropoda
                    [unassigned] Caenogastropoda
                          Cerithioidea
                            Pachychilidae
                                     Pachychilus
                                             Pachychilus chrysalis
                                             Pachychilus corvinus
                                             Pachychilus glaphyrus
                                             Pachychilus graphium
                                                   [Melania graphium]
                                             Pachychilus largillierti
                                                   [Melania largillierti]
                                             Pachychilus pilsbryi
                                             Pachychilus planensis
                                     Sulcospira
                                             Sulcospira infracostata
                                                   [Melania infracostata]