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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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.

Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

Dorsal view of a Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
Lateral view of a Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
Ventral view of a Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
Ruler view of a Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington The smallest ruler marks are 1 mm.
Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
Fairly poor closeup photo of a tarsal claw

Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
Total lack of spines/tubercles on the abdominal segments

Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
This one's meant to show the setae on the edge of the adbominal segments

Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
I don't see any sign here of the excresences that would indicate Ephemerella tibialis

Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington
Maxilla closeup

Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from the Yakima River in Washington

This mayfly was collected from the Yakima River in Washington on April 9th, 2021 and added to Troutnut.com by Troutnut on April 12th, 2021.


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Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

Collection details
Location: Yakima River, Washington
Date: April 9th, 2021
Added to site: April 12th, 2021
Author: Troutnut
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