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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Atelostomata
                    Spatangoida
                      Hemiasterina
                            Schizasteridae
                                     Brisaster
                                             Brisaster fragilis
                                                   [Schizaster fragilis]
                                             Brisaster latifrons
                                                   [Brisaster townsendi]
                                                   [Schizaster latifrons]
                                     Moira
                                             Moira atropos
                                                   [Spatangus atropus]
                                     Schizaster
                                             Schizaster orbignyanus