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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 Namekagon River in Wisconsin

Stream photos

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Sweltsa (Sallfly) Stonefly NymphSweltsa (Sallfly) Stonefly Nymph
Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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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Male Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

I used the ID of this nymph (and some others like it) to infer the identity of a female dun collected on the same trip.

This specimen (top left) is pictured with a couple others from the same kicknet sample just to show the variation in color. Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Dorsal view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Ruler view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Ventral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning 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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Male Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Ephemeroptera (Mayflies)
  5. » Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
  6. » Genus Ephemerella (Hendricksons, Sulphurs, PMDs)
  7. » Species excrucians (Pale Morning Duns)
Collection details
Location: Mystery Creek #249, Washington
Date: July 4th, 2020
Added to site: July 12th, 2020
Author: Troutnut
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