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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Atelostomata
                    Spatangoida
                      Micrasterina
                            Spatangidae
                                     Nacospatangus
                                             Nacospatangus depressus
                                             Nacospatangus laevis
                                     Spatangus
                                             Spatangus californicus
                                             Spatangus purpureus
                                             Spatangus raschii