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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Hydroidolina
                     [Hydroida]
                    Leptothecatae
                           [Leptomedusae]
                            Calycellidae
                                     Calycella
                                             Calycella gracilis
                                             Calycella syringa
                                     Tetrapoma
                                             Tetrapoma quadridentatum