Carcharodon hubbelli (back)

This is a 2.8" tooth from Chile of the transition species between the ancient broad-toothed mako and great white shark. Notice the serrations along the superior portion of the tooth that gradually decrease towards the point, and is non-serrated near the tip.

Here are a couple of lines borrowed from the Buried Treasure Fossils website about this transition tooth:

"C. carcharias transition teeth have recently been renamed to C. hubbelli in honor of Gordon Hubbell who found a complete jaw / partial skeleton in Peru. This find also further solidifies popular opinion that the Great White shark is a descendent of the extinct Big-tooth Mako shark (Isurus xiphodon or Isurus hastalis). Hubbell's skeleton was dated to the late Miocene (6.5 MMYA) which puts it as an intermediate between the Big-tooth Mako and the Great White shark which evolves in the Pliocene, approximately 3 MMYA".