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Female Ephemeroptera (Mayflies) Insect 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 insect was collected from the Long Lake Branch of the White River on June 28th, 2005 and added to Troutnut.com on May 26th, 2006.

Recent Discussions of this Dun

Anyone know what this is?
Posted by Troutnut on Jun 25, 2006
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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