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 Rectracheata
               Superfamily Ephemeroidea Latreille, 1810
                 Family Ephemeridae (Latreille, 1810) Leach, 1815
                   Subfamily Ephemerinae Latreille, 1810
                     1 Genus Ephemera Linnaeus, 1758
                     2 Genus Hexagenia Walsh, 1863
                     3 Genus Litobrancha McCafferty, 1971