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.

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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.

Blue quill maybe?

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

Mlatimer
Posts: 4

Mlatimer on Jul 16, 2020July 16th, 2020, 2:07 am EDT

I was in the smokies fishing the headwaters of Lynn camp a couple weeks ago, and while I was standing admiring the landscape I happened to glance down at my rod only to find a blue quill esk fly had decided to rest on my rod handle. I snapped a couple pictures for identification since Iâ€™m not the most knowledgeable when it comes to specific insect varieties. I would really like to learn more on the entomology side of fly fishing and would like to know more about this guy. I also saw an adult yellow stonefly but it didnâ€™t pose for pictures sadly. My best guess is blue quill but I could be way off, it seems a little on the small side.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Jul 16, 2020July 16th, 2020, 3:47 am EDT

Hi Mlatimer-

My guess would be a species of either genus Neoleptophlebia, or of genus Paraleptophlebia.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Partsman

bancroft michigan

Posts: 321

Partsman on Jul 16, 2020July 16th, 2020, 11:03 am EDT

Mlatimer, I would agree with Taxon, bluequill. I would like to thank Jason, this is the best trout fishing, flyfishing website ever created! All of the folks here are so cool, Matt and Jonathon, and Martin are fishermen that I really take in to consideration for most of the conditions I get envoled with. And so many fine folks have great input from all over the country, this is just such a great learning website. Jason, thanks for all you have done here! And to all those that contribute photos, and the experts such as Taxon, thankyou!
Mike.