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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
These are some of the largest mayflies I've ever seen. There were a great many exuviae on the rocks and shore in selected locations of the river.

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

Moved from Mayflies.

Isonychia velma
These are Isonychia velma nymphs and an adult.

Moved from ID Request.

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