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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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Isonychia bicolor (Mahogany Dun) Mayfly Nymph Pictures

Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Nymph from Cascadilla Creek in New York
Ventral view of a Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Nymph from Cascadilla Creek in New York
Dorsal view of a Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Nymph from Cascadilla Creek in New York

This mayfly was collected from Cascadilla Creek in New York on March 13th, 2005 and added to Troutnut.com by Troutnut on April 5th, 2006.


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Isonychia bicolor (Mahogany Dun) Mayfly Nymph Pictures

Collection details
Location: Cascadilla Creek, New York
Date: March 13th, 2005
Added to site: April 5th, 2006
Author: Troutnut
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