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 Ephemerelloidea Klapalek, 1909
                 1 Family Ephemerellidae Klapálek, 1909
                 2 Family Leptohyphidae (Edmunds & Traver, 1954)