Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Neversink Gorge (Wolf Brook) in New York

Stream photos

Featured on the forum

Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)

Re: Trico Tips
In the Mayfly Genus Tricorythodes by Martinlf

Re: UV spectrum and trout
In General Discussion by Martinlf

Re: closing the gender gap in flyfishing
In General Discussion by Konchu (Smallflyguy replied)

Re: Fishing Kupa River, Slovenia
In Fishing Reports by Slocum (Fish1 replied)

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.

Lepidostoma?

Lepidostoma (Little Brown Sedge) Caddisfly Larva

6 Pictures

Case view of a Lepidostoma (Lepidostomatidae) (Little Brown Sedge) Caddisfly Larva from the Delaware River in New York

Collected May 12, 2007 from the Delaware River in New York

Added by Troutnut on May 18, 2007

Collected May 12, 2007 from the Delaware River in New York and added by Troutnut on May 18, 2007

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Aug 15, 2012August 15th, 2012, 6:08 pm EDT

I believe Lepidostoma has antennae fixed very close and right in front of the eye. I don't see that here. Maybe it's obscured in the image?

Entoman

Northern CA & ID

Posts: 2604

Entoman on Aug 15, 2012August 15th, 2012, 8:45 pm EDT

Yeah, I can't make them out either, but my eyes are pretty blurry this time of night... The antennae are very hard to make out at any time though, usually looking like a tiny pale dot next to the anterior margin of the eye. There's not much to 'em. In a good microscope photo in lateral view, they look like the plunger end of a very tiny retractable ball point pen to me. For me, the best (and easiest way) to identify them is by their having lateral humps on the first abdominal segment while lacking a dorsal hump. Others either have all three or lack them entirely and the cases are different.

"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

PaulRoberts

Colorado

Posts: 1776

PaulRoberts on Aug 16, 2012August 16th, 2012, 7:42 am EDT

I see. Found another web image and the antennae are indeed obscure.