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  Animalia
      Annelida
            Clitellata
              Hirudinea
                Euhirudinea
                    Arhynchobdellida
                           [Gnathobdellida]
                           [Pharyngobdellida]
                      Hirudiniformes
                            Haemadipsidae
                              Haemadipsinae
                                     Diestecostoma
                                             Diestecostoma magna
                                             Diestecostoma mexicana
                                             Diestecostoma octoannulata