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Organism
  Animalia
      Echinodermata
            Crinoidea
              Articulata
                    Comatulida
                      Oligophreata
                            Comatulidae
                                     Comactinia
                                             Comactinia echinoptera
                                             Comactinia meridionalis
                              Comatellinae
                                     Davidaster
                                             Davidaster discoideus
                                                   [Nemaster discoidea]
                                                   [Nemaster insolitus]
                                             Davidaster rubiginosus
                                                   [Nemaster rubiginosa]
                              Comatulinae
                                Comatulini
                                     Leptonemaster
                                             Leptonemaster venustus
                                     Nemaster
                                             Nemaster grandis
                                             Nemaster rubiginosus