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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.

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.

Male Epeorus albertae (Pink Lady) Mayfly Dun Pictures

I collected this male dun with a female dun and a female spinner of the same species. Identification was initially difficult because I didn't catch a male spinner, and this dun was missing its legs. I was able to tease the spinner's penes out of the dun's shuck after it expired, although the shape was pretty similar. Fortunately, the shape is a distinctive match to the Epeorus albertae species group. In the key in Needham et al (1935), it keys to Epeorus youngi, which is now considered a synonym of albertae. It's also a very plausible dun version of this spinner collected a few years earlier, a few drainages to the north, at a similar time of year. Additionally, the female dun and spinner collected with this one match very closely those I've collected in the past.

Lateral view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Artistic view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Dorsal view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Ventral view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington
Ruler view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington The smallest ruler marks are 1 mm.
Microscope closeup of the spinner penes dissected and extracted from the dun's shuck

Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Dun from the Cedar River in Washington

This mayfly was collected from the Cedar River in Washington on July 2nd, 2021 and added to Troutnut.com by Troutnut on July 4th, 2021.


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References

  • Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.

Male Epeorus albertae (Pink Lady) Mayfly Dun Pictures

Collection details
Location: Cedar River, Washington
Date: July 2nd, 2021
Added to site: July 4th, 2021
Author: Troutnut
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