Header image
Enter a name
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.

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
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).
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.

Female Ephemerella excrucians (Pale Morning Dun) Mayfly Dun Pictures

This "specimen" is actually two different duns, one missing the middle front and back left legs, the other missing the terminal filament i.e. middle tail. I added them together by accident, but since they're the same species, stage, and gender, I might as well leave them together.

Ruler view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho The smallest ruler marks are 1 mm.
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Dorsal view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Ventral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho
Ruler view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Big Lost River in Idaho The smallest ruler marks are 1 mm.

This mayfly was collected from the Big Lost River in Idaho on August 2nd, 2020 and added to Troutnut.com by Troutnut on August 18th, 2020.


Start a Discussion of Dun

References

Female Ephemerella excrucians (Pale Morning Dun) Mayfly Dun Pictures

Collection details
Location: Big Lost River, Idaho
Date: August 2nd, 2020
Added to site: August 18th, 2020
Author: Troutnut
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy