Type of organism that does not live on earth any more?

Woolly Mammoths (Mastodons), Saber-toothed Tigers, Prehistoric Camels, Horses, and Bison, as well as many other types of dinosaurs, like the Stegosaurus and Brontosaurus.

In 1938, Indian ocean waters near the mouth of the Chalumna River in South Africa yielded a living fish that was thoughtto have been extinct for 65 million years- the Coelacanth.