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.

We were lucky to be able to fish through this storm as it skirted around us to the north, giving us just enough clouds to prompt a BWO hatch but keeping the lighting at a safe distance.

From Slough Creek 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.

Anyone recognize this Baetid nymph?, Page 2

Male Baetis bicaudatus (BWO) Mayfly Nymph

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Dorsal view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from the Gulkana River in Alaska

Collected July 16, 2011 from the Gulkana River in Alaska

Added by Troutnut on July 20, 2011

Collected July 16, 2011 from the Gulkana River in Alaska and added by Troutnut on July 20, 2011

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Jul 20, 2011July 20th, 2011, 8:41 pm EDT

Unless the setae are long (about 0.60-0.75 X the width of femur), Jason, that would seem to bring us (me) back to A. feropagus/lapponica or perhaps B. foemina. (See above.)

Konchu

Site Editor
Indiana

Posts: 498

Konchu on Jul 21, 2011July 21st, 2011, 3:45 am EDT

foemina should have larger hind wing pads than the acentrella twins. feropagus has shorter setae on the hind margin of the femur than lapponica

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jul 21, 2011July 21st, 2011, 8:27 am EDT

Hope that gets us somewhere.

Yes, back to nowhere. :)

"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

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on Jul 21, 2011July 21st, 2011, 8:38 am EDT

Stay tuned, Kurt. There just may be some light at the end of the taxonomic tunnel....

Entoman

Northern CA & ID

Posts: 2604

Entoman on Jul 21, 2011July 21st, 2011, 9:07 am EDT

Ha! Will do. BTW - those wingpads sure look light for a nymph as close to eclosion as the specimens eye development suggests.

"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