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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Palaeoptera
                       [Paleoptera]
                    Ephemeroptera
                      Furcatergalia
                        Pannota
                          Ephemerelloidea
                            Ephemerellidae
                                     Attenella
                                           [Attenuatella]
                                           [Ephemerella (Attenella)]
                                             Attenella attenuata
                                                   [Ephemerella attenuata]
                                                   [Ephemerella hirsuta]
                                             Attenella delantala
                                                   [Ephemerella delantala]
                                             Attenella margarita
                                                   [Ephemerella margarita]
                                             Attenella soquele
                                                   [Ephemerella soquele]
                                     Caudatella
                                           [Ephemerella (Caudatella)]
                                             Caudatella edmundsi
                                                   [Ephemerella edmundsi]
                                             Caudatella heterocaudata
                                                   [Ephemerella heterocaudata]
                                               Caudatella heterocaudata californica
                                                     [Ephemerella heterocaudata californica]
                                               Caudatella heterocaudata circia
                                                     [Ephemerella heterocaudata circia]
                                               Caudatella heterocaudata heterocaudata
                                                     [Ephemerella columbiella]
                                                     [Ephemerella heterocaudata heterocaudata]
                                             Caudatella hystrix
                                                   [Caudatella cascadia]
                                                   [Ephemerella cascadia]
                                                   [Ephemerella hystrix]
                                                   [Ephemerella spinosa]
                                             Caudatella jacobi
                                                   [Ephemerella jacobi]
                                                   [Ephemerella orestes]
                                     Caurinella
                                             Caurinella idahoensis
                                     Dannella
                                           [Ephemerella (Dannella)]
                                             Dannella lita
                                                   [Ephemerella lita]
                                                   [Timpanoga lita]
                                             Dannella provonshai
                                                   [Ephemerella provonshai]
                                                   [Timpanoga provonshai]
                                             Dannella simplex
                                                   [Ephemerella simplex]
                                                   [Timpanoga simplex]
                                     Dentatella
                                             Dentatella coxalis
                                                   [Dannella bartoni]
                                                   [Dentatella bartoni]
                                                   [Dentatella danutae]
                                                   [Ephemerella bartoni]
                                                   [Ephemerella coxalis]
                                                   [Eurylophella bartoni]
                                                   [Eurylophella coxalis]
                                     Drunella
                                           [Ephemerella (Drunella)]
                                             Drunella allegheniensis
                                                   [Ephemerella allegheniensis]
                                             Drunella coloradensis
                                                   [Ephemerella coloradensis]
                                                   [Ephemerella wilsoni]
                                             Drunella doddsii
                                                   [Drunella doddsi]
                                                   [Ephemerella doddsi]
                                                   [Ephemerella doddsii]
                                             Drunella flavilinea
                                                   [Ephemerella flavilinea]
                                                   [Ephemerella lapidula]
                                             Drunella grandis
                                                   [Ephemerella grandis grandis]
                                                   [Ephemerella grandis]
                                               Drunella grandis flavitincta
                                                     [Ephemerella flavitincta]
                                                     [Ephemerella grandis flavitincta]
                                               Drunella grandis grandis
                                                     [Ephemerella glacialis carsona]
                                               Drunella grandis ingens
                                                     [Ephemerella glacialis glacialis]
                                                     [Ephemerella glacialis]
                                                     [Ephemerella grandis ingens]
                                                     [Ephemerella ingens]
                                                     [Ephemerella proserpina]
                                                     [Ephemerella yosemite]
                                             Drunella lata
                                                   [Drunella cornuta]
                                                   [Drunella cornutella]
                                                   [Drunella longicornis]
                                                   [Ephemerella cornuta]
                                                   [Ephemerella cornutella]
                                                   [Ephemerella depressa]
                                                   [Ephemerella inflata]
                                                   [Ephemerella lata]
                                                   [Ephemerella longicornis]
                                                   [Eurylophella longicornis]
                                             Drunella pelosa
                                                   [Ephemerella pelosa]
                                             Drunella spinifera
                                                   [Ephemerella autumnalis]
                                                   [Ephemerella sierra]
                                                   [Ephemerella spinifera]
                                             Drunella tuberculata
                                                   [Drunella conestee]
                                                   [Ephemerella cherokee]
                                                   [Ephemerella conestee]
                                                   [Ephemerella tuberculata]
                                             Drunella walkeri
                                                   [Baetis fuscata]
                                                   [Drunella wayah]
                                                   [Ephemerella bispina]
                                                   [Ephemerella fuscata]
                                                   [Ephemerella walkeri]
                                                   [Ephemerella wayah]
                                     Ephemerella
                                           [Chitonophora]
                                           [Ephemerella (Ephemerella)]
                                             Ephemerella alleni
                                             Ephemerella apopsis
                                             Ephemerella aurivillii
                                                   [Chitonophora aurivillii]
                                                   [Cincticostella ezoensis]
                                                   [Ephemerella aroni]
                                                   [Ephemerella aronii]
                                                   [Ephemerella aurivilliusi]
                                                   [Ephemerella concinnata]
                                                   [Ephemerella ezoensis]
                                                   [Ephemerella nN]
                                                   [Ephemerella norda]
                                                   [Ephemerella taeniata]
                                             Ephemerella berneri
                                             Ephemerella catawba
                                             Ephemerella dorothea
                                               Ephemerella dorothea dorothea
                                               Ephemerella dorothea infrequens
                                                     [Ephemerella infrequens]
                                                     [Ephemerella mollitia]
                                             Ephemerella excrucians
                                                   [Ephemerella argo]
                                                   [Ephemerella crenula]
                                                   [Ephemerella inermis]
                                                   [Ephemerella lacustris]
                                                   [Ephemerella ora]
                                                   [Ephemerella rama]
                                                   [Ephemerella rossi]
                                                   [Ephemerella semiflava]
                                             Ephemerella hispida
                                             Ephemerella invaria
                                                   [Baetis invaria]
                                                   [Chitonophora vernalis]
                                                   [Ephemerella choctawhatchee]
                                                   [Ephemerella femenina]
                                                   [Ephemerella feminina]
                                                   [Ephemerella floripara]
                                                   [Ephemerella fratercula]
                                                   [Ephemerella inconstans]
                                                   [Ephemerella rotunda]
                                                   [Ephemerella simila]
                                                   [Ephemerella vernalis]
                                             Ephemerella maculata
                                                   [Ephemerella euterpe]
                                             Ephemerella mucronata
                                                   [Chitonophora krieghoffi]
                                                   [Chitonophora mucronata unicolorata]
                                                   [Chitonophora mucronata]
                                                   [Ephemerella krieghoffi intermedia]
                                                   [Ephemerella krieghoffi]
                                                   [Ephemerella moffatae]
                                                   [Ephemerella mucronata unicolorata]
                                                   [Ephemerella unicolorata]
                                             Ephemerella needhami
                                             Ephemerella nuda
                                                   [Ephemerella thymali]
                                                   [Ephemerella verrucosa]
                                             Ephemerella septentrionalis
                                             Ephemerella subvaria
                                             Ephemerella verruca
                                     Eurylophella
                                             Eurylophella aestiva
                                                   [Ephemerella aestiva]
                                             Eurylophella bicolor
                                                   [Ephemerella bicolor]
                                             Eurylophella bicoloroides
                                                   [Ephemerella bicoloroides]
                                             Eurylophella doris
                                                   [Ephemerella doris]
                                                   [Ephemerella trilineata]
                                                   [Eurylophella trilineata]
                                             Eurylophella enoensis
                                             Eurylophella funeralis
                                                   [Ephemerella funeralis]
                                             Eurylophella karelica
                                             Eurylophella lodi
                                                   [Ephemerella lodi]
                                             Eurylophella lutulenta
                                                   [Ephemerella lineata]
                                                   [Ephemerella lutulenta]
                                             Eurylophella macdunnoughi
                                             Eurylophella minimella
                                                   [Ephemerella minimella]
                                             Eurylophella poconoensis
                                             Eurylophella prudentalis
                                                   [Ephemerella prudentalis]
                                             Eurylophella temporalis
                                                   [Ephemerella temporalis]
                                             Eurylophella verisimilis
                                                   [Ephemerella verisimilis]
                                                   [Eurylophella versimilis]
                                     Serratella
                                           [Ephemerella (Serratella)]
                                             Serratella deficiens
                                                   [Ephemerella atrescens]
                                                   [Ephemerella deficiens]
                                             Serratella frisoni
                                                   [Ephemerella frisoni]
                                             Serratella levis
                                                   [Ephemerella levis]
                                             Serratella micheneri
                                                   [Ephemerella altana]
                                                   [Ephemerella micheneri]
                                             Serratella molita
                                                   [Ephemerella molita]
                                                   [Ephemerella serratoides]
                                                   [Serratella serratoides]
                                             Serratella serrata
                                                   [Ephemerella carolina]
                                                   [Ephemerella serrata]
                                                   [Ephemerella sordida]
                                                   [Ephemerella spiculosa]
                                                   [Serratella carolina]
                                                   [Serratella sordida]
                                                   [Serratella spiculosa]
                                             Serratella teresa
                                                   [Ephemerella cognata]
                                                   [Ephemerella teresa]
                                             Serratella tibialis
                                                   [Ephemerella angusta]
                                                   [Ephemerella angustata]
                                                   [Ephemerella sequoia]
                                                   [Ephemerella tibialis]
                                                   [Serratella sequoia]
                                             Serratella velmae
                                                   [Ephemerella velmae]
                                     Timpanoga
                                           [Ephemerella (Timpanoga)]
                                             Timpanoga hecuba
                                                   [Ephemerella hecuba]
                                               Timpanoga hecuba hecuba
                                                     [Ephemerella hecuba hecuba]
                                               Timpanoga hecuba pacifica
                                                     [Ephemerella hecuba pacifica]