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For Insects, Spiders & Their Kin
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Mayfly - Hexagenia limbata - female

Mayfly - Hexagenia limbata - Female
Beaverton, Washington County, Oregon, USA
July 24, 2010
Size: huge
Can anyone ID further? Thank you

Looks like Mayfly...
Probably Hexagenia limbata.

Too late...

Moved from ID Request.

Hexagenia limbata
Hi Eric-

It's a mayfly of family Ephemeridae, specifically a Hexagenia limbata female imago. And yes, they are quite large.

I can't believe the stuff that comes from my backyard!
By the way I took a class in aquatic inverterates...but we didn't cover the adult stages.