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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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.

Suwallia pallidula (Little Yellow Stonefly) Stonefly Adult Pictures

A large number of photos from the microscope allowed a fairly confident ID on this one, which not coincidentally matches very well a previous specimen of Suwallia pallidula that I collected in Washington.

Lateral view of a Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Ventral view of a Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Ruler view of a Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana The smallest ruler marks are 1 mm.
Cerci closeup.

Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Dorsal view of the preserved specimen with wings removed.

Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Fore wing.

Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Hind wing. Note the folded anal area, which is key to identifying this species, actually folded around underneath the rest of the wing in this view (you can see the setae sticking off it).

Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Ventral view of terminal abdominal segments.

Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana
Dorsal view of terminal abdominal segments.

Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Adult from Mystery Creek #237 in Montana

This stonefly was collected from Mystery Creek #237 in Montana on August 1st, 2020 and added to Troutnut.com by Troutnut on August 18th, 2020.


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Suwallia pallidula (Little Yellow Stonefly) Stonefly Adult Pictures

Collection details
Location: Mystery Creek #237, Montana
Date: August 1st, 2020
Added to site: August 18th, 2020
Author: Troutnut
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