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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 Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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 Hydropsyche occidentalis (Spotted Sedges)

Where & when

Time of year : Early Summer

Gary LaFontaine notes in Caddisflies that this prolific Western species tends to be on the water at the same time as Drunella grandis, the Western Green Drake.

In 114 records from GBIF, adults of this species have mostly been collected during July (24%), June (21%), August (18%), May (14%), September (11%), and April (10%).

In 93 records from GBIF, this species has been collected at elevations ranging from 131 to 8914 ft, with an average (median) of 5194 ft.

Species Range

Specimens of the Caddisfly Species Hydropsyche occidentalis

1 Adult

Start a Discussion of Hydropsyche occidentalis

References

Caddisfly Species Hydropsyche occidentalis (Spotted Sedges)

Taxonomy
Species Range
Common Name
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