A wonderful double-sided 3D partial Prognathodon giganteus mosasaur jaw exhibiting complete articulated teeth on both sides showcasing great preservation to the dentin-enamel whilst the stock-root is stable throughout the jaw mandibles. The Cretaceous period Mosasauroidea was featured in Jurassic World - the Mosasaurs were a group of perfectly developed marine reptiles and these predators adorned huge double-hinged jaws with an artillery of teeth. Armed with powerful flippers and streamlined bodies, it was thought Mosasaurs undulated their bodies side to side similar to snakes, however, recent research leads to theorising their bodies remained steady whilst their tail provided power through the ocean.. Aigialosaurs is a more ancient group of aquatic lizards. 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, being the largest. The Mosasaurs reigned for around 20 million years before the mass extinction which ended the existence of the dinosaurs some 65,000,000...

Beaugei arambourg mosasaurus lower mandible jaw measuring 3.9ft. The Mosasaurs were a group of perfectly developed marine predators, resembling a crocodilian and lizard form, with gigantic double-hinged jaws, with artillery of large teeth, fully equipped to tackle the once prehistoric and deadly oceans. Yet to be proven however it is believed the Mosasaurus family were able to unhinge their jaws for a more precise attack and with a much deadlier force 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 leads experts to theorise the Mosasuaurus species anatomy remained quite still whilst their large tail with tremendous strength and power provided the locomotion to propelled them forward. Part of a more ancient group of aquatic lizards, the aigialosaurs group. Mosasaurs breathed air, gave birth to live young and grew from around...

Prognathodon giganteus mosasaurus mandible jaw measuring 3.1ft preserved from the Turonian to Maastrichtian ages 93 to 66 million years ago, ages forming part of the greater time division of the Cretaceous era around 135 to 65 million years ago. The massive mandibles in the original partially articulated positions. The scientifically important specimen of what was once a formidable marine predator is encased in a burlap jacket, this helps aid preservation during excavation. The mandibles consist of two upper parts and two lower parts, these are slightly disarticulated yet in their original placement, in the matrix block; fossil limestone, as at the time of its first discovery in the fossil bed, in the field site. This fossil specimen Mosasaur jaw is a partial section of a tremendously large adult individual. The rare and important factor with this specimen being the teeth which are of exceptional quality. The jaws are huge, the teeth...

Halisaurus arambourgi mosasaur jaw and partial vertebrae measuring 2.9ft, including a well-preserved, nearly complete skull and with lower jaws skeleton, and a partial skull that preserves details of the braincase and quadrate. Halisaurus appeared relatively early in the evolutionary history of the mosasaurs, during the Santonian. As such, the genus retains many primitive characteristics, as does the Halisaurinae at large. Both H. platyspondylus and H. arambourgi reached lengths of between 3 and 4 metres (9.8 - 13.1 feet). The length of the dubious H. onchognathus is difficult to tell due to the lack of remains but was likely similar. As in other halisaurines, the flippers of Halisaurus are poorly differentiated which means that the genus lacked the hydrophalangy of more advanced mosasaurs. That Halisaurus was a relatively poor swimmer is relatively surprising considering its small size, since other small and medium-sized mosasaurs were mostly adept swimmers. Classification and Species: The exact position...