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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.

I like this one. Glacial river, taiga, tundra, and the perpetual ice cover of a massive high ridge dozens of miles away in the Wrangell Mountains. From the Copper River in Alaska

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly AdultIsoperla (Stripetails and Yellow Stones) Stonefly Adult
Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 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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Hesperoperla pacifica (Golden Stone) Stonefly Nymph Pictures

ID notes from the microscope: The occiput has a sinuate, irregularly spaced spinule row.

Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
Dorsal view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
Ruler view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho The smallest ruler marks are 1 mm.
The nymph was out of the water in this picture, because it wouldn't stop wriggling and flip over. Ventral view of a Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho
I had to wait until after this one died in the preservative (alcohol) before I could get a wetted ventral view, because it was too squirmy otherwise. Hesperoperla pacifica (Perlidae) (Golden Stone) Stonefly Nymph from the East Fork Big Lost River in Idaho

This stonefly was collected from the East Fork Big Lost River in Idaho on August 3rd, 2020 and added to Troutnut.com by Troutnut on August 19th, 2020.


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Hesperoperla pacifica (Golden Stone) Stonefly Nymph Pictures

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Plecoptera (Stoneflies)
  5. » Family Perlidae (Golden Stones)
  6. » Genus Hesperoperla (Golden Stones)
  7. » Species pacifica (Golden Stones)
Collection details
Location: East Fork Big Lost River, Idaho
Date: August 3rd, 2020
Added to site: August 19th, 2020
Author: Troutnut
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