ID on this little olive?

The Specimen

View 6 PicturesI found this dun unusually late in the year for anything in the Ephemerellidae family in the East. It's also small for that family.

Collected September 4, 2006 from Willowemoc Creek in New York
Added to Troutnut.com by on October 3, 2006

Troutnut	October 3rd, 2006, 7:15 pm
The Admin Fairbanks, AK Posts: 2021	My Ephemerellidae keys are pretty much garbage when it comes to identifying female duns. I'm wondering if anybody has any insight on this one based on personal experience. There can't be all that many tiny olive Ephemerellids hatching in September. My tentative guess would be Serratella.
	Jason Neuswanger The Troutnut

Taxon	October 3rd, 2006, 10:41 pm
Site Editor Mercer Island, WA Posts: 921	Jason- I'm reasonably confident that it's Attenella margarita.
	Roger Rohrbeck www.FlyfishingEntomology.com

Troutnut	October 4th, 2006, 10:08 am
The Admin Fairbanks, AK Posts: 2021	OK, I'll move it there for now. What makes you sure? I looked through all the scientific papers I have on the likely species again and can't find anything useful. I really wish they described the females and the duns more often.
	Jason Neuswanger The Troutnut

Taxon	October 4th, 2006, 1:23 pm
Site Editor Mercer Island, WA Posts: 921	Jason- Take a look at Fauceglia p. 67. It’s the best photo I’ve found of a Attenella female dun. Incidentally, I hadn’t yet discovered that photo when I offered the earlier opinion, but that reinforced my opinion. In any event, there are a number of factors, which taken together, convinced me: - dorsal pointed finger-like meso-thoractic projection - hind wing costal projection - body coloration - size - early Sep. emergence - presence in NY
	Roger Rohrbeck www.FlyfishingEntomology.com

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