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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.

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.
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 Ephemera varia (Yellow Drake) Mayfly Spinner Pictures

I found this female spinner ovipositing in a small stream. She came along while I was playing a trout -- every good bug seemed to do that last night! I didn't have my bug net, so I caught the trout in my landing net, released the trout, and caught the mayfly in my landing net. Her wing got a bit messed up from that.

Lateral view of a Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York
Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York
Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York
Dorsal view of a Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York
Ventral view of a Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York
Ruler view of a Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York The smallest ruler marks are 1 mm.

This mayfly was collected from Cayuta Creek in New York on July 7th, 2006 and added to Troutnut.com by Troutnut on July 8th, 2006.

Discussions of this Spinner

Surprising Length
3 replies
Posted by Taxon on Jul 10, 2006
Last reply on Sep 13, 2006 by GONZO
Not sure who (originally) came up with a 13-16 mm. length range for Ephemera varia spinners, but I'm suspecting each subsequent author must have just parroted it. Your specimen appears to be 19 mm. in length, and there is certainly no doubt concerning its identity.

Start a Discussion of Spinner

Female Ephemera varia (Yellow Drake) Mayfly Spinner Pictures

Collection details
Location: Cayuta Creek, New York
Date: July 7th, 2006
Added to site: July 8th, 2006
Author: Troutnut
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