Scientists from Sweden’s Uppsala University have pieced together a bizarre marine predator who trolled the seas some 505-million years ago. Hurdia, an extinct species of anomalocaridid, had a giant head, protruding hollow spike-shaped head shield and spiny claws for capturing prey. Bits and pieces of Hurdia have shown up in museums all over the world. Until now, much like their more robust cousin, Anomalocaris, they’ve been left unidentified or wildly mislabeled. Allison Daley, the lead author on the study, is happy to set the record straight and will publish the groups findings in this month’s journal Science.