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.

My then-girlfriend, now-wife took this picture with my camera.

From Toughannock Creek in New York

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.

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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.

?Hydropsychidae ?

Sundula has attached this picture to aid in identification. The message is below.

Sundula
Littleton, Colorado

Posts: 35

Sundula on Sep 10, 2006September 10th, 2006, 5:28 pm EDT

I need help idendifying this caddis larva I beleive it be Hydropsychidae I found it in the North Fork of the South Platte the picture is not the best but the color is fairly true. It is about 12mm long. There were several "nets" in the area and I found it under a rock in a medium speed riffle there was no "net" on the rock I found it under. I am fairly confident of the family but am not sure of the genus. Any info would be nice I am new at the "Name That bug Game".

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 10, 2006September 10th, 2006, 10:00 pm EDT

Sundula-

I'd need to see the head capsule portion of this photo in higher resolution in order to even narrow it down to subfamily (Arctopsychinae, Diplectroninae, Macronematinae, or Hydropsychinae).

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Sundula
Littleton, Colorado

Posts: 35

Sundula on Sep 11, 2006September 11th, 2006, 4:49 am EDT

I couldn't get a good shot of the head it kept moving around. Oh well thanks for the help.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 11, 2006September 11th, 2006, 5:43 am EDT

Was the photo you sent Jason in full resolution?

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Sep 11, 2006September 11th, 2006, 10:06 am EDT

I agree that it's definitely Hydropsychidae, but it's hard from that angle to narrow it down. I notice the view-full-size link on the picture isn't working. I'll try to get that fixed tonight.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist