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.

Turquoise view of Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington

Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.

10 Recently Added Photos

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.

Is this Chloroperlide?

Alloperla (Sallfly) Stonefly Adult

6 Pictures

Lateral view of a Alloperla (Chloroperlidae) (Sallfly) Stonefly Adult from Brodhead Creek in Pennsylvania

This specimen was completely green when I collected it from among many others gathered on a midstream rock along with their nymphal shucks early in the morning. There was also a yellow one with them, which I assumed was a different species. Now that I've seen how this one started changing from green to yellow, I have to wonder if they weren't the same species and the yellow one was just older.

Collected May 28, 2007 from Brodhead Creek in Pennsylvania

Added by Troutnut on June 4, 2007

Collected May 28, 2007 from Brodhead Creek in Pennsylvania and added by Troutnut on June 4, 2007

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Jun 5, 2007June 5th, 2007, 2:41 pm EDT

I just want to double-check this ID, because I've got a couple on-stream pictures of these flies to add. Can anyone confirm?

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Jun 5, 2007June 5th, 2007, 4:46 pm EDT

Jason-

I believe so, but am unable to key it without being able to see hind wing venation. Do you have a photo which clearly displays hind wing venation?

If I were to guess at this point, it would be Haploperla brevis. However, if you have a photo clearly showing hind wing venation, it can accurately be keyed to (at least) genus.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Jun 6, 2007June 6th, 2007, 9:25 am EDT

This certainly looks like Chloroperlidae to me, but I've long been curious about the species. The late May/early June emergence of this species has always been heavy in the Brodhead drainage. The fish largely ignore them when the olive morning dun hatch is in progress, but I've had some success imitating them on early June mornings after the main Drunella hatch ends. I like Roger's Haploperla brevis guess, mostly because it was on the short list of species I was considering as candidates. I'd love to know the species ID for sure, but I doubt that the pictures provide the means to take this specimen to that level.

Myersl
Plattsburgh, NY

Posts: 5

Myersl on Apr 8, 2010April 8th, 2010, 3:36 am EDT

Judging the green color and the size of the adult, all signs indicate to me that this is most likely the genus Alloperla.

myersl