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.

Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Doroneuria baumanni (Golden Stone) Stonefly Nymph Doroneuria baumanni (Golden Stone) Stonefly Nymph

Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington

9 Recently Added Photos

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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Male Baetis bicaudatus (BWO) Mayfly Nymph Pictures

Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from the Gulkana River in Alaska

Dorsal view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from the Gulkana River in Alaska

Ventral view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from the Gulkana River in Alaska

Ruler view of a Male Baetis bicaudatus (Baetidae) (BWO) Mayfly Nymph from the Gulkana River in Alaska The smallest ruler marks are 1 mm.

This mayfly was collected from the Gulkana River in Alaska on July 17th, 2011 and added to Troutnut.com by Troutnut on July 20th, 2011.

Discussions of this Nymph

Anyone recognize this Baetid nymph?

24 replies

Posted by Troutnut on Jul 20, 2011

Last reply on Jul 21, 2011 by Entoman

There aren't all that many baetids reported from Alaska, but I couldn't figure out what this one is. I didn't have a lot of time to look at keys, but here's the whole list of reported Alaskan baetids, with the ones I could obviously eliminate crossed out (and now some that you've eliminated, too):

Acentrella feropagus
Acentrella insignificans
Acentrella lapponica
Acentrella turbida

Baetis bicaudatus
Baetis foemina
Baetis tricaudatus
Baetis bundyae
Baetis flavistriga

Callibaetis

Diphetor hageni

Plauditus dubius

Procloeon pennulatum

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