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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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.

Dragonfly has attached this picture to aid in identification. The message is below.
Wiflyfisher's profile picture

Posts: 622
Wiflyfisher on Mar 29, 2021March 29th, 2021, 12:05 am EDT
I collected this mayfly in Western North Carolina in May and I'm interested to find out the genus and/or species. I am thinking the family is Ephemerellidae. It is about 10mm long. Any ideas?

No, not Ephemerellidae, the sub-imago has only 2 tails.

My guess would be Epeorus genus.
Troutnut's profile picture
Bellevue, WA

Posts: 2758
Troutnut on Mar 29, 2021March 29th, 2021, 6:55 pm EDT
The family is Heptageniidae. I agree with John that Epeorus is a good guess, but I'm not positive from a female dun.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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