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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Palaeoptera
                       [Paleoptera]
                    Ephemeroptera
                      Setisura
                            Isonychiidae
                                     Isonychia
                                             Isonychia arida
                                                   [Baetis arida]
                                                   [Isonychia pictipes]
                                             Isonychia berneri
                                             Isonychia bicolor
                                                   [Chirotonetes albomanicatus]
                                                   [Isonychia albomanicata]
                                                   [Isonychia christina]
                                                   [Isonychia circe]
                                                   [Isonychia fattigi]
                                                   [Isonychia harperi]
                                                   [Isonychia matilda]
                                                   [Isonychia pacoleta]
                                                   [Isonychia sadleri]
                                                   [Palingenia bicolor]
                                                   [Siphlurus bicolor]
                                             Isonychia campestris
                                                   [Isonychia sicca campestris]
                                             Isonychia diversa
                                             Isonychia georgiae
                                                   [Isonychia annulata]
                                                   [Isonychia notata]
                                                   [Isonychia thalia]
                                             Isonychia hoffmani
                                             Isonychia intermedia
                                                   [Chirotonetes intermedius]
                                             Isonychia obscura
                                             Isonychia rufa
                                             Isonychia sayi
                                             Isonychia serrata
                                             Isonychia sicca
                                                   [Baetis sicca]
                                                   [Chirotenetes mancus]
                                                   [Chirotenetes siccus]
                                                   [Chirotonetes mancus]
                                                   [Chirotonetes siccus]
                                                   [Isonychia edmundsi]
                                                   [Isonychia manca]
                                                   [Isonychia sicca manca]
                                                   [Isonychia sicca sicca]
                                                   [Siphlurus siccus]
                                             Isonychia similis
                                                   [Isonychia aurea]
                                             Isonychia tusculanensis
                                             Isonychia velma