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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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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Millcreek has attached these 4 pictures. The message is below.
Female. Collected May 4, 2014.
Male. Collected May 4, 2014.
Male. Collected May 4, 2014.
Males. Collected May 4, 2014.
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Oct 13, 2014October 13th, 2014, 10:13 am EDT
Serratella micheneri nymphs are common in the Russian River from April through May. Most are found in glides with a substrate of large gravel and cobble in a moderate current. Usually found in large numbers on single rocks. I ID'd them to genus using Merritt, Cummins and Berg (2008) and to species with Allen and Edmunds "A Revision of the Genus Ephemerella (Ephemeroptera: Ephemerellidae). VI. The Subgenus Serratella in North America" (1963)http://www.ephemeroptera-galactica.com/pubs/pub_a/puballenr1963p583.pdf and Jacobus and McCafferty "Revisionary Contributions to North American Ephemerella and Serratella (Ephemeroptera: Ephemerellidae) (2003)http://www.ephemeroptera-galactica.com/pubs/pub_j/pubjacobusl2003p174.pdf.

Nymphs are 5-7 mm in length (excluding cerci).
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
PaulRoberts
PaulRoberts's profile picture
Colorado

Posts: 1776
PaulRoberts on Oct 13, 2014October 13th, 2014, 3:49 pm EDT
Wow! Pretty critters they are.
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Oct 13, 2014October 13th, 2014, 4:40 pm EDT
Paul-
Yeah, they are pretty little varmints and like a lot of animals that have a pattern that's broken up like this they're really well camouflaged when in their regular habitat and not in a petri dish. Hope to get some photos of them on rocks next year.
Have you seen these in Colorado? Apparently they've been reported there, as well as a number of other western states.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

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