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Organism
  Animalia
         [Metazoa]
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Cidaroidea
                     [Cidaridea]
                            Ctenocidaridae
                                   [Ctenocidarina]
                                     Aporocidaris
                                             Aporocidaris antarctica
                                             Aporocidaris eltaniana
                                             Aporocidaris fragilis
                                             Aporocidaris milleri
                                             Aporocidaris usarpi
                                     Ctenocidaris
                                       Ctenocidaris (Eurocidaris)
                                             [Eurocidaris]
                                             Ctenocidaris geliberti
                                             Ctenocidaris nutrix
                                                   [Goniocidaris membranipora]
                                               Ctenocidaris nutrix longispina
                                             Ctenocidaris pacifica
                                             Ctenocidaris perrieri
                                             Ctenocidaris speciosa
                                             Ctenocidaris spinosa
                                     Homalocidaris
                                             Homalocidaris gigantea
                                                   [Ctenocidaris gigantea]
                                     Notocidaris
                                             Notocidaris gaussensis
                                             Notocidaris mortenseni
                                     Rhynchocidaris
                                             Rhynchocidaris triplopora