Evolution had a few more drinks once again, according to a new paper in Proceedings of the National Academy of Sciences which wants to prompts a rethink of what it means to be an animal.
Jellyfish, those commonplace sea pests with stinging tentacles, have actually evolved over time into "really weird" microscopic organisms, made of only a few cells, that live inside other animals.
Genome sequencing confirms that myxozoans, a diverse group of microscopic parasites that infect invertebrate and vertebrate hosts, are actually are "highly reduced" cnidarians -- the phylum that includes jellyfish, corals and sea anemones.