**Female Baetis (Blue-Winged Olives) Mayfly Dun Pictures**

Mayflies

Caddisflies

Stoneflies

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Baetidae (Blue-Winged Olives)

» Genus Baetis (Blue-Winged Olives)

I'm guessing this specimen is in the genus Acerpenna because of the very sharp costal process (

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 Troutnut.com on April 22nd, 2006.