Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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Pycnopsyche guttifera (Great Autumn Brown Sedge) Caddisfly Larva Pycnopsyche guttifera (Great Autumn Brown Sedge) Caddisfly Larva

Dorsal view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.

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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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Need help ID Nemoura nymph

Cherylkorca has attached these 5 pictures to aid in identification. The message is below.

Cherylkorca

Posts: 4

Cherylkorca on Feb 18, 2020February 18th, 2020, 4:17 pm EST

Hello, I did recently sampled our home water the Bitterroot river in SW Montana and I collected 2 stoneflys specimens and I know for fact one of them is Skwala nymph but the smaller one wanted to verify if is Nemoura nymph , the problem I am having is that this stone fly nymph appear to be much larger in length that my good reference book Aquatic insects by Rick Hafele shows ?
The do overlap each other i emergance time , Capnia first ( smallest of 3 ) than Nemoura and than biggest Skwala

Thank you for anyone who could help out with this nymph ID , I did include collage with adult Nemoura and hope to be a nymph in same order , but not so sure about the nymph ??

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Feb 19, 2020February 19th, 2020, 2:05 am EST

My guess is that it's not a Nemouridae, but a Perlodidae. The easiest way to tell the difference is to look at the mouth. If you have access to a microscope or a magnifying glass take a look at the glossae and paraglossae, they should be more or less the same size in Nemouridae. In Perlodidae the paraglossae should be much larger than the glossae.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Leskorcala
Posts: 16

Leskorcala on Feb 24, 2020February 24th, 2020, 4:39 pm EST

Hello , Thank you for a great tip to distinguish two however i have bad eyes ( blind on one ) and use magnifying glass 8X but i can not see it.I did take several closeup images with my camera , perhaps I can show it to you.
I need to figure out first how to attach some images.