Equipped with powerful jaws and finely serrated teeth, paleontologists say the 43-foot-long prehistoric marine reptile deserves the name Tylosaurus rex. After remeasuring dozens of mosasaur specimens ...

A mosasaur tooth was discovered in the same displaced Hell Creek block as a T. rex tooth and a freshwater crocodilian jaw.

Add Yahoo as a preferred source to see more of our stories on Google. There's a new T. rex in town, but this one didn't hunt on land. It ruled the ancient seas. The species name means "king of the ...

Tyrannosaurus rex might be the most feared dinosaur to ever walk the Earth, but there was once another T. rex that terrorised the ancient seas. Named Tylosaurus rex, this fierce creature is a massive ...

Earth was a terrifying place during the Cretaceous period, some 66 million to 145 million years ago. During its tail end, Tyrannosaurus rex prowled the land. And a little before that, another kind of ...

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 ...

We preselected all newsletters you had before unsubscribing.

Long before humans existed, giant marine predators ruled the warm prehistoric seas that once covered much of North America. Among them was a newly identified species called Tylosaurus rex, a massive ...

Add Yahoo as a preferred source to see more of our stories on Google. After remeasuring dozens of mosasaur specimens across multiple museums, paleontologists discovered a previously unknown species of ...