Header image
Enter a name
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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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 Ephemerella invaria (Sulphur) Mayfly Dun Pictures

Lateral view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Artistic view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Ruler view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania The smallest ruler marks are 1 mm.
Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania
Ventral view of a Male Ephemerella invaria (Ephemerellidae) (Sulphur) Mayfly Dun from the Little Juniata River in Pennsylvania

This mayfly was collected from the Little Juniata River in Pennsylvania on May 25th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.

Discussions of this Dun

need a good pattern
1 replies
Posted by Anttam on May 19, 2008
Last reply on Jan 7, 2009 by Phishheaduj
any cdc patterns you nuts know of for Sulfpurs?
looking for a site with instructions or any help

Start a Discussion of Dun

Male Ephemerella invaria (Sulphur) Mayfly Dun Pictures

Collection details
Location: Little Juniata River, Pennsylvania
Date: May 25th, 2007
Added to site: June 4th, 2007
Author: Troutnut
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy