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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.
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Epeorus longimanus (Slate Brown Dun) Mayfly Nymph Pictures

Dorsal view of a Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Although difficult to tell in this picture, the gills on the first abdominal segment do meet ventrally in this specimen, a key characteristic for identification.

Ventral view of a Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Ruler view of a Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.
Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Here the meeting and slight overlap on the first pair of gills is more evident.

Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Epeorus longimanus (Heptageniidae) (Slate Brown Dun) Mayfly Nymph from Mystery Creek #249 in Washington

This mayfly was collected from Mystery Creek #249 in Washington on July 4th, 2020 and added to Troutnut.com by Troutnut on July 12th, 2020.


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Epeorus longimanus (Slate Brown Dun) Mayfly Nymph Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: July 4th, 2020
Added to site: July 12th, 2020
Author: Troutnut
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