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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Palaeoptera
                       [Paleoptera]
                    Ephemeroptera
                      Furcatergalia
                        Scapphodonta
                          Ephemeroidea
                            Polymitarcyidae
                                     Campsurus
                                             Campsurus cuspidatus
                                             Campsurus decoloratus
                                                   [Hexagenia decolorata]
                                                   [Palingenia decolorata]
                                             Campsurus emersoni
                                             Campsurus latipennis
                                     Ephoron
                                             Ephoron album
                                                   [Baetis alba]
                                                   [Baetis albus]
                                                   [Palingenia alba]
                                                   [Polymitarcys albus]
                                             Ephoron leukon
                                     Tortopus
                                             Tortopus bellus
                                             Tortopus circumfluus
                                             Tortopus igaranus
                                             Tortopus primus
                                                   [Campsurus manitobensis]
                                                   [Campsurus primus]
                                                   [Tortopus manitobensis]
                                             Tortopus puella
                                                   [Campsurus incertus]
                                                   [Campsurus puella]
                                                   [Palingenia puella]
                                                   [Tortopus incertus]
                                             Tortopus unguiculatus
                                                   [Campsurus unguiculatus]