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Photo#262943
mayfly - Ephemerella aurivillii

mayfly - Ephemerella aurivillii
Pittsfield, Rutland County, Vermont, USA
March 31, 2009
Size: 9mm

Moved
Moved from Ephemerella.

Ephemerella aurivillii
It is. A half-grown one. Reasonably common in cold-water fast streams mainly in the mountains.

Moved

Back off to genus...
until Donald makes a determination. I didn't consider aurivilli, but that might be a better possibility for this one.

Lloyd
I still have the specimen, and will be giving it to Don in a couple weeks.

Does Donald have this one?
Based on the smallish dorsal abdominal spines and the lack of light areas near the middle of the abdomen (though both are variable), I'm inclined toward invaria rather than subvaria.

 
Maybe
even an E. auri*villii. E. sub*varia doesn't look correct, but I am lying in the bushes until I see the specimen.

Moved
Moved from Mayflies.

ephemerellid
same as , only younger

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