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The Specimen

Attenella margarita (Little Western Blue-Winged Olive) Mayfly DunAttenella margarita (Little Western Blue-Winged Olive) Mayfly Dun 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

The Discussion

TroutnutOctober 3rd, 2006, 7:15 pm
Administrator
Bellevue, WA

Posts: 2708
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, Ph.D.
Troutnut and salmonid ecologist
TaxonOctober 3rd, 2006, 10:41 pm
Site Editor
Plano, TX

Posts: 1327
Jason-

I'm reasonably confident that it's Attenella margarita.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutOctober 4th, 2006, 10:08 am
Administrator
Bellevue, WA

Posts: 2708
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, Ph.D.
Troutnut and salmonid ecologist
TaxonOctober 4th, 2006, 1:23 pm
Site Editor
Plano, TX

Posts: 1327
Jason-

Take a look at Fauceglia p. 67. Its the best photo Ive found of a Attenella female dun. Incidentally, I hadnt 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
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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