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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.

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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.
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Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun Pictures

This specimen is really strange, very different in form from any other mayfly I've seen. Unfortunately it was found alone crippled in an eddy and in pretty bad shape, and I couldn't find any others like it.

Ventral view of a Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Dorsal view of a Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin
Ruler view of a Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin The smallest ruler marks are 1/16".
Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin

This mayfly was collected from the Long Lake Branch of the White River in Wisconsin on June 28th, 2005 and added to Troutnut.com by Troutnut on May 26th, 2006.

Discussions of this Dun

Spinadis simplex
1 replies
Posted by Taxon on Jul 19, 2019
Last reply on Jul 20, 2019 by Troutnut
Hi Jason-

I believe this female to be a spinner, rather than a dun, and is probably Spinadus simplex.
Anyone know what this is?
Posted by Troutnut on Jun 25, 2006
Last reply on Jun 25, 2006 by Troutnut
I don't recognize this fly at all, and the major features are too damaged for me to follow my key to families. I'm guessing maybe it's some large and obscure species of Heptageniid, but it could be from some rare family of mayflies too.

Start a Discussion of Dun

Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun Pictures

Collection details
Location: Long Lake Branch of the White River, Wisconsin
Date: June 28th, 2005
Added to site: May 26th, 2006
Author: Troutnut
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