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.

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.

Caddisfly Species Leptocerus americanus

Where & when

Time of year : June and July

Preferred waters: Lakes and ponds

In 80 records from GBIF, adults of this species have mostly been collected during July (36%), June (35%), May (16%), and August (9%).

In 25 records from GBIF, this species has been collected at elevations ranging from 430 to 6972 ft, with an average (median) of 860 ft.

Species Range

source

Map of specific collection sites

Hatching behavior

Gary LaFontaine reports in Caddisflies that the emerging pupae are very important on some eastern spring ponds.

Larva & pupa biology

Current speed: Still

Substrate: Vegetation

Shelter type: Silk

Start a Discussion of Leptocerus americanus

References

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