Paleontologists Disagree About What This Exquisite Shark Fossil Actually Is
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The fossil shark Ptychodus was first identified 190 years ago, but in the intervening centuries of paleontological inquiry, a…
The fossil shark Ptychodus was first identified 190 years ago, but in the intervening centuries of paleontological inquiry, a…
Ptychodus Agassiz, 1834in Vullo, Villalobos-Segura, Amadori, Kriwet, Frey, González, Gutiérrez, Ifrim, Stinnesbeck et Stinnesbec…
Scientists didn't know much about Ptychodus, an ancient shark genus, because its remains were usually just fragments. Now…