|Named By:||Othniel Charles Marsh in 1872|
|Time Period:||Late Cretaceous, 86.5-75 Ma|
|Location:||Canada. USA, particularly the central states|
|Size:||Up to 15 meters long|
|Fossil(s):||Many Specimens as well as numerous teeth|
|Classification:||| Chordata | Reptilia | Squamata | Scleroglossa | Anguimorpha | Mosasauridae | Tylosaurinae ||
Tylosaurus (Greek tulos/tylos "protuberance, knob" + Greek sauros/sauros "lizard") was a mosasaur, a large, predatory marine lizard closely related to modern monitor lizards and to snakes.