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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Asterozoa
               [Stelleroidea]
            Ophiuroidea
                    Phrynophiurida
                      Euryalina
                            Euryalidae
                                     Euryale
                                             Euryale ferox
                                     Trichaster
                                             Trichaster palmiferum