Shenandoah River State Park, Warren County, VA 29 September 2012
A monster of a mayfly.
Hexagenia sp. cf. H. limbata (Ephemeroptera: Ephemeridae).
Burke, Fairfax County, VA
4 July 2013
Yes, a mayfly in Sept. Callibaetis female, I believe. Same as in www.flickr.com/photos/anitagould/2787654562/.
mayfly larvae in a slow-moving stream
Mayflies or shadflies are insects belonging to the order Ephemeroptera (from the Greek εφημερος, ephemeros = "short-lived" (literally "lasting a day" "daily" or "day-long"), πτερον, pteron = "wing", referring to the brief lifespan of adults). They have been placed into an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. They are aquatic insects whose immature stage (called "naiad" or, colloquially, "nymph") usually lasts one year in fresh water. The adults are...