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Big Mayfly - Isonychia

Big Mayfly - Isonychia
Carlotta/Van Duzen River, Humboldt County, County, California, USA
October 1, 2017
Size: 28 mm not counting tails
There were a great many exuvia on the river bank and stones. These are the largest mayflies I've ever seen.

Images of this individual: tag all
Big Mayfly - Isonychia Big Mayfly - Isonychia

Moved from Mayflies.

Red Admiral-

I believe this female subimago (as well as the accompanying image of exuvia) to be of genus Isonychia.

Moved from ID Request.

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