Header image
Enter a name
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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Oct 28, 2008October 28th, 2008, 6:50 am EDT
This looks like Paragnetina to me, and the genital hooks (as best I can make out) seem to fit that ID. My resources for identifying adult Perlidae are pretty thin, so I welcome comments from others. (#707 looks like it might be another.)
Myersl
Plattsburgh, NY

Posts: 5
Myersl on Apr 8, 2010April 8th, 2010, 3:46 am EDT
This is an adult male of Paragnetina immarginata
myersl

Quick Reply

Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy