Hexapods - insects see Epiclass Hexapoda Latreille, 1825
   Class Insecta Linnaeus, 1758 - insects
     Subclass Dicondylia Haeckel, 1866
       Infraclass Pterygota Lang, 1888
         Division Ephemeroptera Hyatt & Arms, 1890
           Order Ephemeroptera Hyatt & Arms, 1891 - mayflies
             Suborder Pisciforma
               Superfamily Heptagenioidea
                 Family Heptageniidae Needham, 1901
                   01 Genus Acanthomola Whiting & Lehmkuhl, 1987
                   02 Genus Anepeorus McDunnough, 1925
                   03 Genus Cinygma Eaton, 1885
                   04 Genus Cinygmula McDunnough, 1933
                   05 Genus Epeorus Eaton, 1881
                   06 Genus Heptagenia Walsh, 1863
                   07 Genus Ironodes Traver, 1935
                   08 Genus Leucrocuta Flowers, 1980
                   09 Genus Macdunnoa Lehmkuhl, 1979
                   10 Genus Nixe Flowers, 1980
                   11 Genus Raptoheptagenia Whiting & Lehmkuhl, 1987
                   12 Genus Rhithrogena Eaton, 1881
                   13 Genus Stenacron Jensen, 1974
                   14 Genus Stenonema Traver, 1933