Ok biology fedi, WTF are these? They look like a miniature horseshoe crabs. I have never seen them before! These are in an ephemeral pool in the slickrock in SE Utah, Vermillion Cliffs National Monument, about 5,000 feet elevation. They are a couple inches long. From above I first thought they were tadpoles but I didn't see their tails wiggling as they swam so I went down for a closer look.

#arthropods #Invertebrates #WhatTheFuckIsThis

https://files.sfba.social/media_attachments/files/111/160/840/541/566/068/original/063ee500e97332f0.mp4