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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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Neoleptophlebia Mayfly Nymph Pictures

Ruler view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York The smallest ruler marks are 1 mm.
Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York
Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York
Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York
Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York
Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York
Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from Mongaup Creek in New York

This mayfly was collected from Mongaup Creek in New York on May 6th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.

Discussions of this Nymph

Neoleptoptphlebia
Posted by Millcreek on Jul 19, 2019
Last reply on Jul 19, 2019 by Millcreek
Should be Neoleoptophlebia. Paper is here. http://biosoil.ru/files/00013828.pdf
BQ Nymph
Posted by Martinlf on Apr 4, 2009
Last reply on Apr 4, 2009 by Martinlf
Jason, thanks. I did look on the site, but somehow overlooked these photos. This is helpful. I also did a general Google image search and got all sorts of colors, but most of the lighter BQ nymphs looked immature, with light wing pads. You and others responding are getting me closer to an answer about my emerger question.

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Neoleptophlebia Mayfly Nymph Pictures

Collection details
Location: Mongaup Creek, New York
Date: May 6th, 2007
Added to site: May 18th, 2007
Author: Troutnut
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