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.

Looking across Island Lake toward the Titcomb Basin—one of the popular crown jewels of the Wind River Mountains

From Island Lake in Wyoming

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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.

Not Stenonema femoratum

Stenonema femoratum (Cream Cahill) Mayfly Nymph

6 Pictures

Dorsal view of a Stenonema femoratum (Heptageniidae) (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York

Collected May 5, 2007 from Mongaup Creek in New York

Added by Troutnut on May 18, 2007

Collected May 5, 2007 from Mongaup Creek in New York and added by Troutnut on May 18, 2007

Dewalt
Posts: 1

Dewalt on Jun 12, 2013June 12th, 2013, 2:05 pm EDT

Only Stenonema left in North America (after taxonomic revision) is S. femoratum. The underside of the abdomen has rows of roundish dark spots at the lateral margins. This one does not.

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jun 12, 2013June 12th, 2013, 2:52 pm EDT

Hi Dewalt -

Welcome to the forum.

This specimen appears to have rounded gills as far as I can tell, and I'm sure Jason had it under a microscope for a better look than shows here. I wasn't aware that sternal maculation was diagnostic for this (now) monotypical genus. What is the source of your information?

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jun 12, 2013June 12th, 2013, 3:21 pm EDT

I'm seeing lateral projections on 2 - 9 and rounded gills. I suggest we hold off on speculative posts that will fill this topic up with unnecessary clutter, at least until we hear more from Dewalt on his rationale. I'd sure like him to be able to address the central issue without having to scroll up the topic too far to find it.

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman