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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
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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Caddisfly Species Onocosmoecus unicolor (Great Late-Summer Sedges)

Where & when

Time of year : Mid-August to late October

Preferred waters: Rivers and lakes

This species is common in the Northwest and present but uncommon in the East.

In 83 records from GBIF, adults of this species have mostly been collected during August (35%), July (25%), September (22%), and October (11%).

In 55 records from GBIF, this species has been collected at elevations ranging from 16 to 10840 ft, with an average (median) of 5092 ft.

Species Range

Specimens of the Caddisfly Species Onocosmoecus unicolor

2 Adults
1 Male Adult
1 Larva

Start a Discussion of Onocosmoecus unicolor


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

Caddisfly Species Onocosmoecus unicolor (Great Late-Summer Sedges)

Species Range
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