This small mayfly was on the wall of the HQ at the fish hatchery. Roger Rohrbeck (on BugGuide) identified it as a subimago male of this genus, a member of the "Small Minnow Mayflies" (Baetidae).
Como 2 cm de largo aprox
Encontré la especie en mi casa que estaba cálida. Fue difícil de fotografiar ya que es muy pequeño y vuela.
Heptagenia longicauda (Stephens 1835)
San Diego County, California, US
Collected from riffle and bank vegetation. Common species within reach.
Collected from sandbar/riffle.
Small mayfly with patterned wings. Taken from a spider web just above a stream, hence tangled appearance.
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...