Mayfly

Brownish in colour with net like wings. The body was approx 1/2 an inch in size. Mayflies are aquatic insects whose immature stage usually lasts one year in freshwater. The adults are short-lived, from a few minutes to a few days depending on the species. About 2,500 species are known worldwide. Eggs are laid on the surface of lakes or streams, and sink to the bottom. Naiads moult 20 to 30 times over a period of a few months up to a year, depending on the species. The naiads live primarily in streams under rocks, decaying vegetation, or in the sediment. The naiad stage may last from several months to several years, with a number of moults along the way. Most mayfly naiads are distinctive in having seven pairs of gills on the dorsum of the abdomen. In addition, most possess three long cerci or tails at the end of their bodies. Some species, notably in the genus Epeorus, have only two tails. In the last aquatic stage, dark wingpads are visible. Mayflies are unique among insects in that they moult one more time after acquiring functional wings. The lifespan of an adult mayfly is very short and varies depending on the species. The primary function of the adult is reproduction; the mouthparts are vestigial, and the digestive system is filled with air.