How many different types of sharks are there on earth?

FLY GUY PRESENTS SHARKS

Right now I think I could be able to name 10 kinds of sharks...

A GRAY REEF SHARK

A BLUE SHARK
A LEOPARD SHARK

A SPINY DOGFISH SHARK
A BASKING SHARK
A PREHISTORIC SHARK
A MEGALODON

A BULL SHARK

A GREAT WHITE SHARK

AND A GREENLAND SHARK.

Can you name 5 sharks?