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  Animalia
    Radiata
      Cnidaria
        Medusozoa
            Hydrozoa
                   [Leptolida]
              Hydroidolina
                     [Hydroida]
                    Siphonophorae
                      Calycophorae
                            Sphaeronectidae
                                     Sphaeronectes
                                             Sphaeronectes gracilis
                                             Sphaeronectes irregularis