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Female Baetis (Blue-Winged Olives) Mayfly Dun Pictures

 I'm guessing this specimen is in the genus Acerpenna because of the very sharp costal process (
The costal process of a Baetidae dun.
The costal process of a Baetidae dun.
Costal process: A bump or point sticking up from the front margin of an insect's wing, usually the rear wing of certain mayflies. It is sometimes called a costal projection.
on her hind wing. I'm guessing pygmaea because it is the most common species.

Editor note: Not Acerpenna. This is most likely Baetis. See comments on this male specimen for rationale. Also compare with the female specimen associated with it.

This mayfly was collected from the Bois Brule River on July 1st, 2005 and added to on April 22nd, 2006.

Recent Discussions of this Dun

Posted by Flytyer0423 on Aug 20, 2009
when the one wing is like the one in the picture thats called a crippled mayfly?
ReplyID 4 Replies »
Posted by Taxon on Jul 1, 2006
Last reply on Sep 21, 2006 by Troutnut

My guess would be Baetis brunneicolor.


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