Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
Troutnut on Jun 18, 2007June 18th, 2007, 4:10 pm EDT
I don't think it's Epeorus, because the eyes would be closer together in that genus. It's certainly in the Heptageniidae family, but I wouldn't be able to really narrow it down beyond that.
It would help if you've got a picture showing the entire fore legs.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Konchu on Jun 18, 2007June 18th, 2007, 5:45 pm EDT
yeah to what troutnut said
could be Rhithrogena, based on wing venation (anastomies), abdomen color (generally reddish, but I'm not sure about some of the markings) and femoral maculation (median dark blotch)
the dark wing veins are reminiscient of some other genus, perhaps, but I'm drawing a blank at this hour when my mind is numb...take what I say with a grain of salt however