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Organism
  Animalia
         [Metazoa]
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Cidaroidea
                     [Cidaridea]
                    Cidaroida
                          Histocidaroidea
                                 [Histocidaridea]
                            Histocidaridae
                                   [Histocidarina]
                                     Histocidaris
                                           [Poriocidaris]
                                             Histocidaris australiae
                                             Histocidaris cobosi
                                             Histocidaris crassispina
                                             Histocidaris elegans
                                                   [Cidaris elegans]
                                             Histocidaris misakiensis
                                                   [Histocidaris mikasiensis]
                                             Histocidaris nuttingi
                                             Histocidaris purpurata
                                             Histocidaris sharreri
                                             Histocidaris variabilis