Phylum Arthropoda Siebold, 1848 - arthropods Class Insecta Linnaeus, 1758 - insects Subclass Pterygota Lang, 1888 - winged insects see Infraclass Pterygota Lang, 1888 Division Exopterygota Sharp, 1899 Order Ephemeroptera Hyatt & Arms, 1891 - mayflies Family Heptageniidae Needham, 1901