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.

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington

I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.

11 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.

Male Leptophlebia cupida (Black Quill) Mayfly Dun Pictures

This Leptophlebia cupida dun was extremely cooperative, and it molted into a spinner for me in front of the camera. Here I have a few dun pictures and one spinner picture, and I've put the entire molting sequence in an article.

Male Leptophlebia cupida (Leptophlebiidae) (Black Quill) Mayfly Dun from the Teal River in Wisconsin

Lateral view of a Male Leptophlebia cupida (Leptophlebiidae) (Black Quill) Mayfly Dun from the Teal River in Wisconsin

Dorsal view of a Male Leptophlebia cupida (Leptophlebiidae) (Black Quill) Mayfly Dun from the Teal River in Wisconsin

This mayfly was collected from the Teal River in Wisconsin on May 27th, 2005 and added to Troutnut.com by Troutnut on May 16th, 2006.

Discussions of this Dun

Midwest/Great Lakes hatch reports anyone?

11 replies

Posted by Konchu on Mar 30, 2007

Last reply on Feb 26, 2008 by Taxon

Saw a nice Leptophlebia cupida/nebulosa spinner today while I was sitting on the front porch; it met its demise in my wife's soda, unfortunately. That's the first one I've noticed this year. What else, if anything, is everyone seeing so far this spring? The Ameletus from the stream behind my house will be hatching soon, maybe yet this weekend, if the weather cooperates.

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