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Organism
  Animalia
      Cnidaria
            Hydrozoa
              Hydroidolina
                     [Hydroida]
                    Leptothecata
                          Plumularioidea
                            Phylactothecidae
                                     Hydrodendron
                                             Hydrodendron alternatum
                                                   [Ophiodissa alternata]
                                             Hydrodendron laxum
                                                   [Ophiodissa laxa]