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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.

The Yakima River in Washington

Stream photos

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Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington
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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

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Ephemeroptera (Mayflies)
  5. » Family Heptageniidae (March Browns, Cahills, Quill Gordons)
  6. » Genus Epeorus (Little Maryatts)
  7. » Species longimanus (Slate Brown Duns)
Collection details
Location: Mystery Creek #249, Washington
Date: July 4th, 2020
Added to site: July 12th, 2020
Author: Troutnut
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