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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

5 Recently Added Photos

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.

Female Epeorus vitreus (Sulphur) Mayfly Spinner Pictures

Lateral view of a Female Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Mystery Creek #43 in New York

Female Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Mystery Creek #43 in New York

Ventral view of a Female Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Mystery Creek #43 in New York

Dorsal view of a Female Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Mystery Creek #43 in New York

Ruler view of a Female Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Spinner from Mystery Creek #43 in New York The smallest ruler marks are 1 mm.

This mayfly was collected from Mystery Creek #43 in New York on September 19th, 2006 and added to Troutnut.com by Troutnut on October 4th, 2006.

Discussions of this Spinner

First Sighting

Posted by Martinlf on May 25, 2008

Last reply on May 25, 2008 by Martinlf

I saw my first E. vitreus spinner yesterday on a small spring creek in Blair County, PA. What a gorgeous bug! It was love at first sight. Thanks for the photo, Jason. I'm saving it in my fish porn folder.

Peculiar Heptageniid

2 replies

Posted by Troutnut on Oct 4, 2006

Last reply on Oct 5, 2006 by GONZO

Most of this relatively large spinner's features make me think Maccaffertium but the fore tarsal ratio and the upward slant of the basal costal crossveins seem to fit Epeorus. Any thoughts? I'm guessing it's a late-season vitreus.

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References

Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.