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.

The Clark's Fork of the Yellowstone River in Wyoming

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Tricorythodes (Trico) Mayfly Nymph Tricorythodes (Trico) Mayfly Nymph

Dorsal view of a Tricorythodes (Leptohyphidae) (Trico) Mayfly Nymph 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.

Finally my "Stenonema" section isn't empty

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

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on May 18, 2007May 18th, 2007, 7:49 am EDT

I've been looking for one of these for a while. After I realized that everything I was calling Stenonema had been renamed to Maccaffertium, the section for this once-popular genus was empty. Now with this one from a small stream in the Catskills I'm pretty sure I've got an actual Stenonema again.

I would welcome a verification from those of you with more entomological training, but it looks right to me.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Quillgordon
Schuylkill County, PA.

Posts: 109

Quillgordon on May 20, 2007May 20th, 2007, 2:09 pm EDT

Is this insect in this genus solely based on its gill structure?
It seems odd that there is only one species in this new classification.
I think I have a specimen that was found on 5/18/07.

Flyfishing is a state of mind! .............. Q.g.

C/R........barbless

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on May 20, 2007May 20th, 2007, 2:40 pm EDT

I don't know, but I doubt the gill structure is the entire reason for genus differentiation. It's probably just the most visible of many differences.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist