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Organism
  Animalia
      Echinodermata
            Echinoidea
              Euechinoidea
                    Spatangoida
                            Brissidae
                              Brissopsinae
                                     Brissopsis
                                             Brissopsis atlantica
                                             Brissopsis columbaris
                                             Brissopsis elongata
                                             Brissopsis pacifica
                                     Brissus
                                             Brissus obesus
                                             Brissus unicolor
                                     Meoma
                                             Meoma ventricosa
                                               Meoma ventricosa frangibilis
                                                     [Meoma frangibilis]
                                     Metalia
                                             Metalia nobilis
                                     Plagiobrissus
                                             Plagiobrissus grandis
                                             Plagiobrissus pacificus