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.

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

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.

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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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Caddisfly Species Glossosoma intermedium (Saddle-case Makers)

Where & when

Time of year : March through August

Preferred waters: Streams and spring ponds

This species is spread out across the continent, but most abundant in the Midwest.

In 86 records from GBIF, adults of this species have mostly been collected during June (30%), July (28%), April (12%), May (8%), March (7%), and August (6%).

In 50 records from GBIF, this species has been collected at elevations ranging from 7 to 6322 ft, with an average (median) of 266 ft.

Species Range

source

Map of specific collection sites

Start a Discussion of Glossosoma intermedium

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.