Unless they find another one, closer to that original trunk in the tree of animal life. They studied exactly two sponges and two comb jellies. Perhaps there's

Unless they find another one, closer to that original trunk in the tree of animal life. They studied exactly two sponges and two comb jellies. Perhaps there's a microscopic organism, or a sea squirt or something as yet unclassified in the ocean. But for now, cousin Comb Jelly takes the crown!