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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Hydroidolina
                     [Hydroida]
                    Leptothecatae
                           [Leptomedusae]
                            Orchistomatidae
                                     Mesonema
                                             Mesonema coelum
                                     Orchistoma
                                             Orchistoma agariciforme
                                             Orchistoma pileus
                                                   [Mesonema pileus]