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.

A small, old rock wing dam has created an excellent riffle and pool in this classic trout stream.

Stream photos

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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

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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.

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Caddisfly Species Limnephilus spinatus (Summer Flier Sedges)

Where & when

Time of year : Late June

Preferred waters: Streams and spring ponds

This species is most abundant in spring ponds.

In 41 records from GBIF, adults of this species have mostly been collected during August (44%), July (29%), June (15%), and September (10%).

In 6 records from GBIF, this species has been collected at elevations ranging from 6545 to 9318 ft, with an average (median) of 8850 ft.

Species Range

source

Map of specific collection sites

Larva & pupa biology

Current speed: Still to slow

Start a Discussion of Limnephilus spinatus

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.