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).
I just got back from spending most of two days in the Catskills. I caught my first decent trout of the year (beautiful 19" brown) and on my way back I sampled nymphs at a couple streams and got lots of great stuff. It's 20 minutes past midnight and I'm just about to start an all-night photo session with the new bugs, including some Baetisca obesa nymphs.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist