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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Atelostomata
                    Spatangoida
                      Holasterina
                            Urechinidae
                                     Cystechinus
                                     Urechinus
                                             Urechinus drygalskii
                                               Urechinus drygalskii drygalskii
                                               Urechinus drygalskii perfidus
                                             Urechinus loveni
                                                   [Cystechinus loveni]
                                             Urechinus naresianus