Here's a photo from my own lab work at college: It's a Daphnia... like a water flea, looks kinda like Cthulu, except around the size of a pinhead
Brine Shrimp A.K.A. Gotta love the disclaimer on the bottom: Caricatures shown not intended to depict Artemia Salina. Man, I miss the 70's.
Coming from a bio student, that's a gorgeous Brine Shrimp picture! Those little buggers are alot of fun to work with as well. I wish I'd gotten to play with Sea Monkeys as a kid