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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Hydroidolina
                     [Hydroida]
                    Anthoathecatae
                           [Anthomedusae]
                           [Athecatae]
                           [Stylasterina]
                      Capitata
                             [Zancleoidea]
                            Hydridae
                                   [Hydrida]
                                     Chlorohydra
                                             Chlorohydra hadleyi
                                             Chlorohydra viridissima
                                     Hydra
                                             Hydra americana
                                             Hydra canadensis
                                             Hydra carnea
                                             Hydra cauliculata
                                             Hydra hymanae
                                             Hydra littoralis
                                             Hydra minima
                                             Hydra oligactis
                                             Hydra oregona
                                             Hydra pseudoligactis
                                             Hydra rutgerensis
                                             Hydra rutgersensis
                                             Hydra utahensis