A newly described creature from the Cambrian period is putting a bizarre twist on what we thought we knew about early animal evolution. Meet Mosura fentoni—a three-eyed, clawed, and flappy-limbed predator about the size of your finger, recently identified from Canada’s famed Burgess Shale. The alien-looking animal is part of a group called radiodonts, a now-extinct lineage of arthropods best known for Anomalocaris, a three-foot-long (one-meter-long) sea terror with spiny limbs and a circular mouth full of teeth. Beyond its sci-fi looks, Mosura is also offering rare glimpses of internal anatomy from half a billion years ago. “So many science fiction creatures have been inspired by living organisms,” Moysiuk said.