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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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Capniidae (Snowfly) Stonefly Adult Pictures

Capniidae (Snowfly) Stonefly Adult from Salmon Creek in New York
Capniidae (Snowfly) Stonefly Adult from Salmon Creek in New York
Dorsal view of a Capniidae (Snowfly) Stonefly Adult from Salmon Creek in New York
Ventral view of a Capniidae (Snowfly) Stonefly Adult from Salmon Creek in New York
Capniidae (Snowfly) Stonefly Adult from Salmon Creek in New York
Capniidae (Snowfly) Stonefly Adult from Salmon Creek in New York

This stonefly was collected from Salmon Creek in New York on March 29th, 2006 and added to Troutnut.com by Troutnut on April 7th, 2006.

Discussions of this Adult

BodyColor?
12 replies
Posted by DarkDun on Jan 9, 2007
Last reply on Jan 11, 2007 by Softhackle
What is body color? Are these likely to occurr in the Appallacians?

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References

Capniidae (Snowfly) Stonefly Adult Pictures

Collection details
Location: Salmon Creek, New York
Date: March 29th, 2006
Added to site: April 7th, 2006
Author: Troutnut
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