Phylum Arthropoda Siebold, 1848 - arthropods Count: - Class Insecta Linnaeus, 1758 - insects Count: - Subclass Pterygota Lang, 1888 - winged insects see Infraclass Pterygota Lang, 1888 Count: - Division Exopterygota Sharp, 1899 Count: - Order Ephemeroptera Hyatt & Arms, 1891 - mayflies Count: - Family "Isonychidae" Burmeister, 1855 Count: - Genus Isonychia Eaton, 1871 Count: -