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Organism
  Animalia
      Cnidaria
            Hydrozoa
              Hydroidolina
                     [Hydroida]
                    Leptothecata
                            Haleciidae
                                     Halecium
                                             Halecium bermudense
                                             Halecium dyssymetrum
                                             Halecium lightbourni
                                             Halecium nanum
                                             Halecium regulare
                                             Halecium tenellum
                                     Nemalecium
                                             Nemalecium lighti
                                     Sagamihydra
                                             Sagamihydra dyssymetra