May fly found in fresh water stream
Penobscot County, Maine, US
Mayfly nymph, from under a rock alongside a river.
3, Blasturus sp.
Attracted to a mercury vapor lamp. Very small, probably 1 cm excluding tails.
Mayflies or shadflies are insects belonging to the order Ephemeroptera (from the Greek εφήμερος, ephemeros = "short-lived" (literally "lasting a day" "daily" or "day-long"), and πτερόν, 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...