The mayfly spinner is the second adult winged stage of the mayfly life cycle.  The spinners hatch once the duns have left the water's surface and found cover on the underside of leaves and vegetation.  Once there the duns hatch into spinners.  The spinners have clear wings as opposed to the milky wings of the dun.  The body is also much whiter with clear black rings.  Once early evening arrives the spinners start their distinctive mating dance with great swarms filling the air.  Mating takes place and the female spinners make their way to the water to deposit their eggs.  The female spinners die after depositing their eggs and great carpets of dead and dying mayfly can cover the water's surface