The first fossils were discovered in an 18th-century limestone quarry near Maastricht on the river Meuse. When first discovered the skeleton was thought to be that of a dragon and the major of Maastricht had the fossil bones put on display in a glass case for all to marvel at the size of the amazing new discovery.
Mosasaurus was a prehistoric marine reptile, a marine creature with immense and powerful jaws, preying on other marine reptiles, ammonites and large nautili. This is part of a group of marine reptiles which attained great size in the Cretaceous before becoming extinct, for runners of the great sharks and cetaceans which filled the gap they left in the world's oceans.
The Cretaceous period marine reptile featured in the saga of Jurassic world films. The Mosasaurs were a group of perfectly developed marine predators, resembling a crocodilian and lizard form, huge double-hinged jaws and skulls armed with many teeth; It is thought they could unhinge their jaws and gulp down large prey. Powerful flippers and streamlined bodies. At first, it was thought that Mosasaurs used their bodies like snakes or eels when swimming, in an undulating side to side movement. However, the most recent research nows leads us to theorise their bodies remained stiff and a large fluked tail provided the locomotion which propelled the Mosasaur.
Part of a more ancient group of aquatic lizards, the aigialosaurs group. Mosasaurs breathed air, gave birth to live young and grew from around 3 feet; Dallasaurus turneri, the smallest Mosasaur to 50 feet in length; Mosasaurus hoffmannii, the largest. The Mosasaurs reigned for around 20 million years before the mass extinction which also ended the dinosaurs' existence, around 65 million years ago at the K-T boundary event. This was the last 20 million years of the Cretaceous period. The Turonian to Maastrichtian ages.
Genus: Prognathodon mosasaurus. (Mosasauridae family).
Age: Mesozoic era, Cretaceous Period, Turonian to Maastrichtian ages, approximately 135 to 65 million years.
Origin: From the Khouribga formation, Casablanca, Morocco, North Africa.
Mosasaurus tooth measurements.
Length: 5.5 cm
Height: 6.0 cm
Depth: 2.2 cm
Approximate weight: 0,066 g