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  Animalia
      Arthropoda
            Insecta
                    Ephemeroptera
                            Ephemerellidae
                                     Attenella
                                             Attenella delantala
                                             Attenella soquele
                                     Caudatella
                                             Caudatella edmundsi
                                             Caudatella hystrix
                                     Caurinella
                                             Caurinella idahoensis
                                     Drunella
                                             Drunella coloradensis
                                             Drunella grandis
                                             Drunella pelosa
                                     Ephemerella
                                             Ephemerella altana
                                             Ephemerella delantala
                                             Ephemerella edmundsi
                                             Ephemerella glacialis
                                             Ephemerella levis
                                             Ephemerella pelosa
                                             Ephemerella rama
                                             Ephemerella sequoia
                                             Ephemerella soquele
                                             Ephemerella spinosa
                                             Ephemerella verruca
                                             Ephemerella wilsoni
                                     Serratella
                                             Serratella levis
                                             Serratella sequoia