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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Atelostomata
                    Spatangoida
                      Holasterina
                            Pourtalesiidae
                                     Ceratophysa
                                             Ceratophysa valvaecristata
                                     Cystocrepis
                                             Cystocrepis setigera
                                                   [Echinocrepis setigera]
                                     Echinocrepis
                                             Echinocrepis gracilis
                                             Echinocrepis rostrata
                                     Pourtalesia
                                             Pourtalesia tanneri
                                             Pourtalesia thomsoni
                                     Rodocystis
                                             Rodocystis rosea