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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Hymenoptera
                      Symphyta
                          Cephoidea
                            Cephidae
                                     Cephus
                                             Cephus cinctus
                                             Cephus pygnaeus
                                     Janus
                                             Janus abbreviatus
                                             Janus integer
                                     Trachelus
                                             Trachelus labidus