What's That Bug? does not endorse extermination

Subject: River bug
Location: Pacific Northwest USA
August 11, 2017 11:05 pm
Hi! I have been swimming in the Mohawk River in Marcola Oregon my entire life. I have never seen one of these little critters before. It was tiny. I caught it and released. Reminded me of a scorpion. It had fluttering fins(?) behind its legs. I am wondering if it is a larva or?
Signature: Johanna Leighty

Spiny Crawler Mayfly Naiad

Dear Johanna,
The aquatic larvae of flying insects with incomplete metamorphosis including Dragonflies and Stoneflies are known collectively as naiads.  We believe this is a Naiad of a Spiny Crawler Mayfly from the family Ephemerellidae based on this and other BugGuide images, but we are unable to provide a conclusive species identification.  Here is another similar looking individual posted to BugGuide.

What's That Bug? does not endorse extermination
Location: Marcola, Oregon

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