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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Palaeoptera
                       [Paleoptera]
                    Ephemeroptera
                      Furcatergalia
                        Pannota
                          Caenoidea
                            Caenidae
                                     Amercaenis
                                             Amercaenis ridens
                                                   [Caenis ridens]
                                     Brachycercus
                                             Brachycercus arcticus
                                             Brachycercus berneri
                                                   [Brachycercus floridicola]
                                             Brachycercus edmundsi
                                             Brachycercus flavus
                                             Brachycercus harrisella
                                                   [Brachycercus magnus]
                                                   [Caenis harrisella]
                                                   [Caenis pennata]
                                                   [Eurycaenis harrisella]
                                             Brachycercus lacustris
                                                   [Brachycercus idei]
                                                   [Brachycercus pallidus]
                                                   [Caenis lacustris]
                                                   [Eurycaenis idei]
                                                   [Eurycaenis pallida]
                                             Brachycercus maculatus
                                                   [Brachycercus pini]
                                             Brachycercus minutus
                                             Brachycercus nasutus
                                             Brachycercus nitidus
                                                   [Eurycaenis nitidus]
                                             Brachycercus prudens
                                                   [Eurycaenis prudens]
                                             Brachycercus tuberculatus
                                     Caenis
                                             Caenis amica
                                                   [Caenis simulans]
                                             Caenis anceps
                                             Caenis arwini
                                             Caenis bajaensis
                                             Caenis candida
                                             Caenis diminuta
                                               Caenis diminuta diminuta
                                               Caenis diminuta latina
                                             Caenis hilaris
                                                   [Ephemera hilaris]
                                             Caenis latipennis
                                                   [Caenis delicata]
                                                   [Caenis forcipata]
                                                   [Caenis gigas]
                                                   [Caenis jocosa]
                                             Caenis macafferti
                                             Caenis punctata
                                             Caenis tardata
                                             Caenis youngi
                                     Cercobrachys
                                             Cercobrachys cree
                                             Cercobrachys etowah
                                             Cercobrachys serpentis