Palaeocarcharodon

Palaeocarcharodon, also known as the pygmy white shark, is a genus of shark within the family Otodontidae that lived about 61.7 to 55.8 Ma during the Paleocene. It currently contains a sole species P. orientalis.

Description
Teeth of Palaeocarcharodon are triangular, labio-lingually compressed, with quite irregular serrations and serrate lateral cusplets. They can reach a size of about 3 - 6 cm.