Carcharodon hubbelli (front)

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. When you put this tooth between an equivalent ancient mako and great white tooth, it is hard to argue that there is not evolutionary flow in from of your eyes. I am in the process of aquiring similar sized ancient mako and great white from the same location. I will post those once they are in my collection.

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".