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The Specimen

Baetis (Blue-Winged Olives) Mayfly DunBaetis (Blue-Winged Olives) Mayfly Dun View 4 PicturesI'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.
Collected July 1, 2005 from the Bois Brule River in Wisconsin
Added to by on April 22, 2006

The Discussion

Flytyer0423August 20th, 2009, 8:54 pm
germansville PA

Posts: 14
when the one wing is like the one in the picture thats called a crippled mayfly?
(vistit my website @)

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