This lovely critter is Hurdia victoria, which terrorized Cambrian seas 500 million years ago. Since being fossilized squished Hurdia into paleo-roadkill, scientists have only just reconstructed it from bits and pieces of the Burgess shale already in museum collections.
Hurdia, a primitive arthropod, was pretty monstrous for the time – up to a foot and a half long. It had a toothy circular jaw with little claws, compound eyes and a giant head carapace. Scientists think it might have lurked along the ocean floor, using its monstrous head to funnel trilobites to their doom.