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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Holothuroidea
                   [Cryptosyringida]
              Apodacea
                    Molpadiida
                            Gephyrothuriidae
                                     Gephyrothura
                                             Gephyrothura alcocki