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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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Pteronarcys dorsata (American Salmonfly) Stonefly Nymph Pictures

Video Clip

Pteronarcys

This stonefly was collected from the Namekagon River in Wisconsin on February 7th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.

Discussions of this Nymph

Salmonfly nymph anatomy
1 replies
Posted by Adirman on Sep 10, 2010
Last reply on Sep 11, 2010 by Dryfly
Hey, what'sm with those wierd fuzzy looking things under its belly and forearms? Is that some sort of traction thing for sticking to stuff?
Salmonfly nymph anatomy
2 replies
Posted by Adirman on Sep 10, 2010
Last reply on Sep 11, 2010 by Adirman
Hey, what'sm with those wierd fuzzy looking things under its belly and forearms? Is that some sort of traction thing for sticking to stuff?
stoneflies
1 replies
Posted by Blackghost on May 1, 2009
Last reply on May 4, 2009 by Martinlf
I haven't tied a lot of stonefly nymphs. In most cases the river I fish don't really have a lot of stoneflies. Where would be the best place to look for stonflies. In fast running water.

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Pteronarcys dorsata (American Salmonfly) Stonefly Nymph Pictures

Collection details
Location: Namekagon River, Wisconsin
Date: February 7th, 2004
Added to site: January 25th, 2006
Author: Troutnut
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