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.

Stream photos

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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) Stonefly Adult from Mystery Creek #308 in Washington

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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.

Acroneuria abnormis (Golden Stone) Stonefly Nymph Pictures

Perlidae stonefly nymph. A large predator of clean freshwater streams

Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York

Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York

Dorsal view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York

Ventral view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York

Ruler view of a Acroneuria abnormis (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York The smallest ruler marks are 1/16".

This stonefly was collected from Fall Creek in New York on March 29th, 2006 and added to Troutnut.com by Troutnut on April 6th, 2006.

Discussions of this Nymph

Probably Acroneuria lycorias

1 replies

Posted by GONZO on Oct 10, 2006

Last reply on Oct 28, 2008 by GONZO

I've been staring at this one for quite some time. My first impression was lycorias (Boreal Stone, Giant Brown Stonefly). I'm pretty familiar with this species, but I don't know of a good key to Acroneuria at the species level.

The lack of a row of spinules along the occiput of the head and presence of postocular and pronotal fringes all say Acroneuria for sure.

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