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Organism
  Animalia
      Echinodermata
        Asterozoa
            Asteroidea
              Ambuloasteroidea
                Neoasteroidea
                  Valvatacea
                    Paxillosida
                            Astropectinidae
                                     Astropecten
                                             Astropecten alligator
                                             Astropecten americanus
                                             Astropecten articulatus
                                                   [Astropecten comptus]
                                             Astropecten cingulatus
                                                   [Astropecten nitidus]