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Organism
  Animalia
      Mollusca
            Gastropoda
                            Planorbidae
                                     Ancylinae
                                           [Ancylidae]
                                     Ancylus
                                     Glyptophysa
                                             Glyptophysa petiti
                                     Gyraulus
                                             Gyraulus convexiusculus
                                             Gyraulus corinna
                                             Gyraulus montrouzieri
                                             Gyraulus rossiteri
                                     Helisoma
                                             Helisoma duryi
                                     Menetus
                                             Menetus opercularis
                                                   [Planorbis opercularis]
                                     Planorbella
                                             Planorbella duryi
                                                   [Helisoma duryi normale]
                                     Planorbis