Is this a water scorpion?
Location:  Woodacre, CA
September 12, 2010 11:30 am
Dear Bugman,
We live in west Marin County, CA. My son Jonah and I found this small bug in the water at the edge of our local creek on April 21, 2010. My son, who was 6-1/2 at the time, casually commented that it looked like a scorpion, and dubbed it ”water scorpion.” Last night when I was looking at other bugs on your web site, I saw that there is a bug called a water scorpion. Did my son hit the nail on the head?
Signature:  Mark & Jonah

Mayfly Naiad

Hi Mark & Jonah,
Your insect is not a Water Scorpion.  This appears to us to be the aquatic nymph of a Mayfly in the order Ephemeroptera, and like other aquatic nymphs, it is commonly called a Naiad.  It bears a close resemblance to the nymphs in the genus
Epeorus, as evidenced by this image on BugGuide.

Mayfly Naiad

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