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 Clark's Fork of the Yellowstone River in Wyoming

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington

I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.

11 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 Drunella flavilinea (Flav) Mayfly Dun Pictures

I can't be certain of the ID of this female dun, but I'm calling it Drunella flavilinea for three reasons: 1) the known abundance of "flavs" on the Henry's Fork, 2) clear differences in coloration from my confirmed specimens of Drunella coloradensis, which is the main lookalike, and 3) the habitat (a sizable river in a wide mountain valley, rather than a small, high-altitude stream) suggests it's not coloradensis.

Female Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Henry's Fork of the Snake River in Idaho

Dorsal view of a Female Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Henry's Fork of the Snake River in Idaho

Lateral view of a Female Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Henry's Fork of the Snake River in Idaho

Ventral view of a Female Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Henry's Fork of the Snake River in Idaho

I accidentally preserved this one in alcohol before remembering to do the length measurements, so I fished it out of the drink for this photo.

Ruler view of a Female Drunella flavilinea (Ephemerellidae) (Flav) Mayfly Dun from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1 mm.

This mayfly was collected from the Henry's Fork of the Snake River in Idaho on July 31st, 2020 and added to Troutnut.com by Troutnut on August 16th, 2020.

Discussions of this Dun

Tying the Flav

1 replies

Posted by Lowell on Mar 8, 2021

Last reply on Mar 11, 2021 by Roguerat

Looking for picture of successful Flav pattern. With materials list and explanation of any critical tying steps. Both dry and nymph.

Lowell

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