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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.

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.
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Dragonfly has attached this picture to aid in identification. The message is below.
Wiflyfisher
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Wisconsin

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
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Administrator
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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