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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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.

Male Doroneuria baumanni (Golden Stone) Stonefly Adult Pictures

I found this stonefly on some streamside vegetation. I didn't see any in the air in several hours of fishing.

Lateral view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Ventral view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Ruler view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington The smallest ruler marks are 1 mm.
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Dorsal view of a Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Metabasisternum with a good view of the furcal pits and sutures that confirm the family ID.

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Dorsal view of the terminalia.

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington
Dorsal closeup view of the terminalia.

Male Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Adult from the Foss River in Washington

This stonefly was collected from the Foss River in Washington on September 10th, 2020 and added to Troutnut.com by Troutnut on September 19th, 2020.


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Male Doroneuria baumanni (Golden Stone) Stonefly Adult Pictures

Collection details
Location: Foss River, Washington
Date: September 10th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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