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Organism
  Animalia
         [Metazoa]
      Mollusca
            Gastropoda
              Caenogastropoda
                    Littorinimorpha
                          Rissooidea
                                 [Rissoacea]
                            Palaeorissoinidae
                              Greveniellinae
                                     Greveniella
                                             Greveniella mesohellenica
                              Palaeorissoininae