Complete fossils from an enormous shark that lived alongside the dinosaurs reveal crucial information about this enigmatic predator — including it being an ancient relative of the great white shark.
"The discovery of complete Ptychodus specimens is really exciting because it solves one of the most striking enigmas in vertebrate paleontology," lead author Romain Vullo, a researcher at Géosciences Rennes, told Live Science in an email. Related: 325 million-year-old shark graveyard discovered deep within Mammoth Cave harbors new fossilized species
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