Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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 Rhyacophila lobifera (Green Sedges)

Where & when

Time of year : May and June

This species is reportedly most common in Pennsylvania and New York.

In 29 records from GBIF, adults of this species have mostly been collected during April (45%), May (31%), March (10%), and June (7%).

In 25 records from GBIF, this species has been collected at elevations ranging from 374 to 4183 ft, with an average (median) of 2805 ft.

Species Range

source

Map of specific collection sites

Egg-Laying behavior

Gary LaFontaine reports in Caddisflies that adults of this species may gather in tight balls and float along on the surface. I have observed this peculiar behavior in other caddisfly species, and I assume it has something to do with mating.

Start a Discussion of Rhyacophila lobifera

References

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