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Rock clinging mayfly nymph

Rock clinging mayfly nymph
Norris -- Madison River, Madison County, Montana, USA
May 13, 2013

Moved from ID Request.

I can't quite decide which one, though.

Hi Brady
From what I see I would lean to Heptagenia. I see some features that push me that way. But because it is a young one being around the 13th instar with faint marking it is tough to ever be sure. I am not the best with the "west" I study the East. It may have been a heptagenia elequenta. Knowing the size wouldn't help too much with it being so young. A ventral view of it might help.


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