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Organism
  Animalia
      Mollusca
            Gastropoda
                    Cycloneritida
                            Hydrocenidae
                                     Georissa
                                           [Omphalorissa]
                                             Georissa biangulata
                                             Georissa brevissima
                                             Georissa cookei
                                                   [Georissa neali]
                                             Georissa elegans
                                             Georissa insularis
                                             Georissa kauaiensis
                                             Georissa laevigata
                                             Georissa minutissima
                                             Georissa parva
                                             Georissa rufula
                                             Georissa striata
                                     Hydrocena
                                     Omphalorissa