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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae) » Ecdyonurus
Photo#700245
Mayfly Nymph - Ecdyonurus
Copyright © 2012 Dick Palmer

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.
Contributed by Dick Palmer on 5 September, 2012 - 6:01pm
Last updated 3 October, 2012 - 11:06pm

Moved
Moved from Mayflies.
… Roger Rohrbeck, 3 October, 2012 - 11:06pm

Ecdyonurus
Hi Dick-

I believe this Heptageniid to be of genus Ecdyonurus.
… Roger Rohrbeck, 3 October, 2012 - 11:03pm

Moved
Moved from ID Request.
… John F. Carr, 3 October, 2012 - 7:23pm

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