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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Troutnut.com User Softhackle (Mark Libertone)

Troutnut.com User Softhackle (Mark Libertone)

Real Name
Mark Libertone
Location
Wellsville, NY
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Biography & Thoughts
I am a trained artist with a B.F.A. in Fine Art and a Masters in Synaesthetic Education, both from Syracuse University. Currently, I teach, part time, for Empire State College, and operate a graphic and fine art business. I'm a native New Yorker, and I still live in NY close to the banks of the Genesee River. I'm married with 5 children, 14 grandchildren, and one great grandchild on the way.

To me, Fly-fishing is an art and science, combined, and as such it is the experience, and perhaps sharing it, that is so very important to enjoyment of it.

Note from Troutnut: Unfortunately, we lost Mark several years ago. Because he was such a valued member of this community, I mirrored his webpage (with permission from his family) in a subfolder here (linked above), so we can all continue to appreciate his great artwork.
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"I have the highest respect for the skilled wet-fly fisherman, as he has mastered an art of very great difficulty." Edward R. Hewitt

Flymphs, Soft-hackles and Spiders: http://www.troutnut.com/libstudio/FS&S/index.html

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