The specimens, found in northeastern Mexico, belong to Ptychodus - a creature that roamed the seas from around 105m to 75m years ago.
Ptychodus fossils have turned up before but with its bones made of cartilage, which does not mineralise well, many just consisted of teeth. As a result, exactly what Ptychodus looked like, and where it sat on the evolutionary family tree, was somewhat difficult to pin down.
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