Stelladens

Stelladens lived about 72 to 66 million years ago, at the very end of the Age of Dinosaurs.3

Its teeth had 2 to 4 sharp, serrated ridges on the inside, like little star blades. No other animal, alive or extinct, has teeth like this.2

Stelladens was about 5 metres (16 feet) long, as big as a small boat.1

The only fossils found so far are a piece of jaw and two teeth. That is enough to know it was a new kind of mosasaur.21

Stelladens belonged to a group called Mosasaurinae, which includes some of the biggest sea lizards ever.32

Its teeth were short and strong, good for crushing, not just stabbing like other fish-eaters.2