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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.

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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Stonefly Species Isoperla bilineata (Yellow Sallies)

This is a common olive brown species.

Where & when

Time of year : May and June

In 97 records from GBIF, adults of this species have mostly been collected during June (31%), May (29%), April (21%), and July (12%).

In 14 records from GBIF, this species has been collected at elevations ranging from 618 to 11430 ft, with an average (median) of 3478 ft.

Species Range

Hatching behavior

Time of day : Late night

Egg-Laying behavior

Time of day: Evening


Start a Discussion of Isoperla bilineata

References

Stonefly Species Isoperla bilineata (Yellow Sallies)

Species Range
Resources
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