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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.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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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Female Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Spinner Pictures

I'm calling this one Ephemerella dorothea infrequens because it was collected along with two males that positively ID to that species.

Lateral view of a Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Dorsal view of a Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Ruler view of a Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana The smallest ruler marks are 1 mm.
Ventral view of a Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana
Female Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Madison River in Montana

This mayfly was collected from the Madison River in Montana on July 1st, 2019 and added to Troutnut.com by Troutnut on July 18th, 2019.


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Female Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Spinner Pictures

Collection details
Location: Madison River, Montana
Date: July 1st, 2019
Added to site: July 18th, 2019
Author: Troutnut
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