Subject: Underwater centipede??
Geographic location of the bug: Alta, CA
Time: 12:29 AM EDT
So, our house wraps around the remnants of a historic gold mine with access to the mine from a back door. There is a fresh water spring that flows from miles back, with several small, dammed pools about a quarter mile in. Today while spelunking, we crossed the path of a peculiar centipede looking insect below the water in a pool about 8 to 10 inches deep! He had a sort of swim/crawl movement and I’d say about 3 inches long and a half inch thick. Wondering if he’s a native ethereal dweller or some sort of astral crosser come to us from The Upsidedown.
How you want your letter signed: the good people of InnerEarth
Dear good people of InnerEarth,
This is an aquatic larva of a flying insect, and we are relatively certain it is a member of the family Corydalidae, which includes Dobsonflies and Fishflies. The similar looking larva of the Eastern Dobsonfly is known as a Hellgrammite. Here is a BugGuide image of a Fishfly larva. Your larva might be that of a California Dobsonfly, Neohermes californicus.