|Scientific name :||Tylosaurus proriger|
|Time period :||Late Cretaceous period|
|Primary diet :||Carnivores|
|In the series|
|Fatalities caused :||Three Sharks|
|Appearances :||Evolution's Winners|
It is one of the largest of the mosasaurs, reaching lengths of 46 ft.
Tylosaurus may not been a caring parent, as seen in the episode although it is debated at the time. Tylosaurus may have lived alone and it almost certainly could harm an animal like Archelon.
A mosasaur, possibly Tylosaurus makes a cameo in this episode as a victim of the mass extinction that killed off most marine reptiles, flying reptiles (pterosaurs), and dinosaurs.