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Organism
  Animalia
         [Metazoa]
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                Irregularia
                  Atelostomata
                    Spatangoida
                           [Amphisternata]
                           [Spatangidea]
                      Holasterina
                            Calymnidae
                                     Calymne
                                             Calymne relicta
                                     Sternopatagus