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Wchougland has attached this picture to aid in identification. The message is below.
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WchouglandJanuary 12th, 2021, 6:53 pm
Posts: 1This bug and hundreds like it are on a still water pond in central colorado, at about 10,000’. July-August. Air temps around 70F. I can not find anything like it on any site I’ve searched.
TroutnutJanuary 12th, 2021, 7:26 pm
Administrator
Bellevue, WA

Posts: 2704
This looks to me like an oblique view of a spent mayfly spinner with its wings stuck to the water, possibly Callibaetis as there seems to be a bit of a dark mottling near the front of the wings, but it's hard to be sure in this picture. Callibaetis would certainly make sense for high lakes.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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