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Organism
  Animalia
         [Metazoa]
      Mollusca
            Gastropoda
              Neritimorpha
                    Cycloneritida
                          Helicinoidea
                            Helicinidae
                                     Helicina
                                           [Rostrata]
                        Helicoidei
                          Helicoidea
                            Trissexodontidae
                                     Gasullia
                                             Gasullia gasulli
                                             Gasullia riffensis
                                                   [Hatumia riffensis]
                                     Gasulliella
                                             Gasulliella simplicula
                                     Gittenbergeria
                                             Gittenbergeria turriplana
                                     Hatumia
                                             Hatumia cobosi
                                     Mastigophallus
                                             Mastigophallus rangianus
                                                   [Helix rangiana]
                                     Oestophora
                                             Oestophora barbula
                                                   [Helix barbula]
                                             Oestophora barrelsi
                                             Oestophora calpeana
                                             Oestophora dorotheae
                                             Oestophora lusitanica
                                             Oestophora maroccana
                                             Oestophora ortizi
                                             Oestophora silvae
                                             Oestophora tarnieri
                                     Oestophorella
                                             Oestophorella buvinieri
                                     Suboestophora
                                             Suboestophora boscae
                                             Suboestophora hispanica
                                             Suboestophora jeresae
                                             Suboestophora tarraconensis
                                     Trissexodon
                                             Trissexodon constrictus
                              Trissexodontinae
                                Carcacollinini
                                     Caracollina
                                             Caracollina huloti
                                             Caracollina lenticula
                                Oestophorini
                                Trissexodontini