Mosasaurus

Mosasaurus ( /ˌmoʊzəˈsɔrəs/; "lizard of the Meuse River") is a genus of mosasaur, carnivorous, aquatic lizards, somewhat resembling flippered crocodiles, with elongated heavy jaws. The genus existed during the Maastrichtian age of the Cretaceous period (Mesozoic era), around 70–65 million years ago in the area of modern Western Europe and North America. The name means "Meuse lizard", as the first specimen was found near the Meuse River (Latin Mosa + Greek sauros lizard).