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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

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.

Dorsal view of a Skwala (Perlodidae) (Large Springfly) Stonefly Nymph from the Yakima River in Washington
This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Female Baetis (Blue-Winged Olive) Mayfly Dun Pictures

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

Lateral view of a Female Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from the Bois Brule River in Wisconsin
Female Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from the Bois Brule River in Wisconsin
Dorsal view of a Female Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from the Bois Brule River in Wisconsin
Ventral view of a Female Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from the Bois Brule River in Wisconsin

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

Discussions of this Dun

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

My guess would be Baetis brunneicolor.

Roger

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Female Baetis (Blue-Winged Olive) Mayfly Dun Pictures

Collection details
Location: Bois Brule River, Wisconsin
Date: July 1st, 2005
Added to site: April 22nd, 2006
Author: Troutnut
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