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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Atelostomata
                    Spatangoida
                      Micrasterina
                            Brissidae
                                     Brissopsis
                                             Brissopsis alta
                                             Brissopsis atlantica
                                             Brissopsis elongata
                                             Brissopsis lyrifera
                                             Brissopsis mediterranea
                                             Brissopsis pacifica
                                     Brissus
                                             Brissus brissus
                                                   [Spatangus brissus]
                                             Brissus latecarinatus
                                             Brissus unicolor
                                     Meoma
                                             Meoma ventricosa
                                                   [Spatangus ventricosus]
                                     Plagiobrissus
                                             Plagiobrissus grandis