Mosasaurus fossil tooth (1.88") on Matrix - Cretaceous, Morocco

Mosasaurus was one of the biggest predators that lived in the seas during the Cretaceous era. With a serpentine body, powerful flippers, and a set of formidable teeth, these apex predators ruled the oceans during the Late Cretaceous period.  

Mosasaurs were expert swimmers, using their streamlined forms to hunt a variety of prey, including fish and other marine creatures. Their adaptions for aquatic life, such as flippers instead of legs, made them well-suited to the oceans.

PS: The tip is missing