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Blue-winged Olives

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.

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.

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.

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