By Mindy Weisberger, CNN
A digital illustration of a Tylosaurus catching a small plesiosaur.
Paleontologists have long hailed Tyrannosaurus rex as king of the dinosaurs.
Now, the name 'T rex' also belongs to a newly described extinct carnivore - a massive marine reptile with the scientific name Tylosaurus rex that a trio of researchers uncovered after a hefty amount of detective work.
The freshly crowned T rex wasn't a dinosaur, but a mosasaur - a gigantic ocean apex predator that lived about 80 million years ago - a bit earlier than the dinosaur king, which lived 66-68m years ago and measured up to 43 feet (13 metres) long.
