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> > Serratella micheneri nymphs

Millcreek has attached these 4 pictures. The message is below.
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Female. Collected May 4, 2014.
Female. Collected May 4, 2014.
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Male. Collected May 4, 2014.
Male. Collected May 4, 2014.
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Male. Collected May 4, 2014.
Male. Collected May 4, 2014.
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Males. Collected May 4, 2014.
Males. Collected May 4, 2014.
MillcreekOctober 13th, 2014, 2:13 pm
Healdsburg, CA

Posts: 356
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).
PaulRobertsOctober 13th, 2014, 7:49 pm
Colorado

Posts: 1776
Wow! Pretty critters they are.
MillcreekOctober 13th, 2014, 8:40 pm
Healdsburg, CA

Posts: 356
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.

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