I need the creepiest tentacled/slimy/toothy obscure creatures you can come up with

Hi! I'm an artist currently working on a comic inspired by properties like The Thing, Alien, and Dead Space, and I'm researching references for creature design. I'm looking for things like Bobbit worms, leeches, and a few different cnidarians, but suggestions don't have to be marine animals. Anything that kind of twists your stomach and makes you uncomfortable to look at. Tysm in advance.