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Mayfly Nymph - Ecdyonurus

Mayfly Nymph - Ecdyonurus
Cedar River at Landsburg Reach, King County, Washington, USA
September 3, 2012
Size: 6 mm
I found quite a few of these crawling on the undersurface of several rocks lying in the stream bed. They ranged in size from 4 to 7 mm. At first I thought they might be stonefly nymphs, but they each had three cerci so I'm sure they are mayflies.

Moved from Mayflies.

Hi Dick-

I believe this Heptageniid to be of genus Ecdyonurus.

Moved from ID Request.

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