Jourdy, if you're still out there, they look like damselfly larvae.
Jumpman, at first your description sounded like a water flea, Daphnia or Bosmina. But I think you may have a mosquito pupa, not a larvae but pupa, kind of looks like a little shrimp. If so it won't be there for long, will probably be on the back of you neck instead.
Crawling doesn't really support that theory, though.