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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Trachylina
                    Trachymedusae
                            Petasidae
                                     Dipetasus
                                     Petachnon
                                     Petasiella
                                             Petasiella asymmetrica
                                     Petasus
                                             Petasus atavus
                                             Petasus digonimus
                                                   [Dipetasus digonimus]
                                             Petasus tiaropsis
                                                   [Petachnon tiaropsis]