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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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.

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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.

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Male Calineuria californica (Golden Stone) Stonefly Adult Pictures

A few of these larger stoneflies were fluttering around the South Fork on an evening dominated by much smaller species.

This one has been difficult to identify. I can't spot any of the gill remnants characteristic of Perlidae, but the wing venation seems to point in that direction. I tried keying it out as Perlodidae but arrived at Isoperla, every western species of which has significantly smaller bodies than this one.

Edit: See forum comments for a likely correct identification.

Lateral view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

Ventral view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

Ruler view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.

Taken with my usual glare-reducing polarized light and filter.

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

Taken without my usual glare-reducing polarized light and filter, so the glare might enhance some details.

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

I plan to try to start capturing wing venation in more of my photos for better identifiability.

Dorsal view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

This stonefly was collected from the South Fork Snoqualmie River in Washington on July 20th, 2019 and added to Troutnut.com by Troutnut on July 22nd, 2019.

Discussions of this Adult

Hesperoperla or Calineuria

2 replies

Posted by Millcreek on Jul 22, 2019

Last reply on Jul 22, 2019 by Millcreek

Hesperoperla or Calineuria. Just a guess. These are similar to ones I've netted in California. The gill remnants don't always show and can be difficult to spot when they do. The size is right and the wing veining as well.

Here's a picture at bugguide of Hesperoperla.

https://bugguide.net/node/view/1257709

I'm leaning more towards Calineuria.
https://www.zoology.ubc.ca/~biodiv/entomology/main/Plecoptera/Perlidae/Calineuria%20californica%20(1dorsal).jpg

And here's a view of Hesperoperla's wings.

https:/bugguide.net/node/view/41324/bgimage

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