The remains of a huge new half-a-billion-year-old extinct animal have been unearthed in the Rocky Mountains. Scientists uncovered the fossil belonging to the newly discovered species that roamed the seas during the Cambrian period. Named Titanokorys gainesi, these animals had a distinctive protective head shell and were much bigger than many other species at the time, researchers said. At an estimated total length of half a meter (1.6 feet), Titanokorys was a giant compared to most animals that lived in the seas at that time—many of which barely reached the size of a pinkie finger. From an evolutionary standpoint, the species belongs to a group of primitive invertebrates—or arthropods—called radiodonts, scientists said. The most iconic representative of this group is the streamlined predator Anomalocaris, which may itself have approached a meter (3.3 feet) in length. Like all radiodonts, Titanokorys had multifaceted eyes; a pineapple slice-shaped, tooth-lined mouth; a pair of …