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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 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.
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Alloperla (Sallfly) Stonefly Nymph Pictures

Ruler view of a Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington The smallest ruler marks are 1 mm.
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Dorsal view of a Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Ventral view of a Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from Swauk Creek in Washington

This stonefly was collected from Swauk Creek in Washington on June 13th, 2022 and added to Troutnut.com by Troutnut on June 14th, 2022.


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Alloperla (Sallfly) Stonefly Nymph Pictures

Collection details
Location: Swauk Creek, Washington
Date: June 13th, 2022
Added to site: June 14th, 2022
Author: Troutnut
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