Prognathodon, marine reptile tooth in its mandible fragment, Morocco, Cretaceous (70 million years old), with base, h. 13 cm

Note: The Prognathodon is one Earth's most ferocious marine predators ever to have existed. Belonging to the mosasauridae family, these giant marine reptiles are related to lizards and snakes. The largest specimens in this family reached more than 17 metres in length.