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Opabinia regalis was a strange animal that lived in the Cambrian seas of what is now British Columbia. It was originally discovered by C. D. Walcott and described in 1912. It was small, between 4-7cm in length. It had five eyes, four of which were positioned above the head on stalks while the fifth one was placed in the middle of the head. It had 15 body segments and one tail segment. Each one of the body segments bore a pair of thin plate-like lateral lobes with gills attached to their upper side. The tail had three pairs of lobes. It had a strange nozzle-like appendage on its head that could curve backwards to deliver food to its backwards-facing mouth. While its place in the tree of life is uncertain, it was likely a stem arthropod.