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Organism
  Animalia
         [Metazoa]
      Mollusca
            Gastropoda
              Heterobranchia
                Euthyneura
                Tectipleura
                  Eupulmonata
                    Stylommatophora
                      Mesurethra
                            Dorcasiidae
                                     Dorcasia
                                             Dorcasia alexandri
                                             Dorcasia cernua
                                             Dorcasia coagulum
                                             Dorcasia rogersi
                                     Trigonephrus
                                             Trigonephrus ambiguosus
                                             Trigonephrus globulus
                                                   [Helix globulus]
                                             Trigonephrus gypsinus
                                             Trigonephrus haughtoni
                                             Trigonephrus latezonatus
                                             Trigonephrus lucanus
                                             Trigonephrus namaquensis
                                             Trigonephrus porphyrostoma
                                             Trigonephrus rosaceus
                                     Tulbaghinia
                                             Tulbaghinia isomerioides