What is Tylosaurus rex and why is it shaking up paleontology? If you thought Tyrannosaurus rex was the most terrifying predator of the dinosaur age, get ready to meet its marine equivalent: Tylosaurus rex, a newly described mosasaur species identified by scientists from the American Museum of Natural History, the Perot Museum of Nature and Science, and Southern Methodist University. This prehistoric giant measured up to 43 feet (13 meters) in length and ranks among the largest mosasaurs ever discovered. To put it in perspective: it was roughly twice the length of the largest great white sharks ever recorded. A discovery hiding in museum drawers for decades The story behind…