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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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Millcreek has attached these 7 pictures. The message is below.
Healdsburg, CA

Posts: 344
Millcreek on May 9, 2015May 9th, 2015, 7:05 am EDT
These were determined to genus using Merritt, Cummins and Berg (2008) as well as Wiggin's "Larvae of the North American Caddisfly Genera" (1996). They were identified to species using Don Burdick's illustrations of Trichoptera. Mature male pupae were used to make the species determination.

The mature larvae were 3 - 3.5 long with the cases measuring about 4 mm in length. The pupal cases were about 4 - 4.5 mm long. The larvae were found on Cladophora algae in a fairly fast flow. The pupal cases were in aggregations on the rocks.
"If we knew what it was we were doing, it would not be called research, would it?"
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PaulRoberts's profile picture

Posts: 1776
PaulRoberts on May 10, 2015May 10th, 2015, 3:10 pm EDT
Neat. Nice images. Thanks for these.

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