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Organism
  Animalia
         [Metazoa]
      Mollusca
            Gastropoda
              Heterobranchia
                Euthyneura
                Acteonimorpha
                          Rissoelloidea
                            Rissoellidae
                                     Cythnia
                                             Cythnia albida
                                             Cythnia asteriaphila
                                     Jeffreysia
                                             Jeffreysia hera
                                             Jeffreysia tenuis
                                     Rissoella
                                           [Heterorissoa]
                                           [Zelaxitas]
                                             Rissoella abacoensis
                                             Rissoella alaskensis
                                             Rissoella anguliferens
                                             Rissoella caribaea
                                             Rissoella confusa
                                             Rissoella contrerasi
                                             Rissoella cystophora
                                                   [Laevilitorina cystophora]
                                             Rissoella diaphana
                                                   [Rissoella glabra]
                                             Rissoella galba
                                             Rissoella globularis
                                                   [Jeffreysia globularis]
                                             Rissoella hertleini
                                             Rissoella inflata
                                             Rissoella opalina
                                             Rissoella sanguinea
                                             Rissoella tumens