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 Family Siphlaenigmatidae Penniket, 1962