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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 Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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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Suwallia pallidula (Little Yellow Stonefly) Stonefly Nymph Pictures

This specimen keys out to Suwallia, for which I did not find any nymph species keys. However, I'm placing it in Suwallia pallidula because I caught a few adults in the same spot that closely resembled the abundant nymphs and keyed them out to species. Features I noted under the microscope when keying this specimen to genus included apical hairs of cercal segments that were directed at posterior angles, and the longest apical hairs of distal segments were shorter than their following segment.

Dorsal view of a Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Nymph from Mystery Creek #199 in Washington
Ventral view of a Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Nymph from Mystery Creek #199 in Washington
Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Nymph from Mystery Creek #199 in Washington
Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Nymph from Mystery Creek #199 in Washington
Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Nymph from Mystery Creek #199 in Washington
Ruler view of a Suwallia pallidula (Chloroperlidae) (Sallfly) Stonefly Nymph from Mystery Creek #199 in Washington The smallest ruler marks are 1 mm.

This stonefly was collected from Mystery Creek #199 in Washington on July 28th, 2019 and added to Troutnut.com by Troutnut on July 30th, 2019.


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Suwallia pallidula (Little Yellow Stonefly) Stonefly Nymph Pictures

Collection details
Location: Mystery Creek #199, Washington
Date: July 28th, 2019
Added to site: July 30th, 2019
Author: Troutnut
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