Mystery of the Spiral Tooth 'Shark'

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Helicoprion was an ancient fish that lived many millions of years ago before the dinosaurs. For over one hundred years the only evidence of these prehistoric sea creatures were their very strange spiral teeth. This video will explain the difficulty that can be had in paleontology sometimes and how this fish was constructed in the end.

Sources:
https://royalsocietypublishing.org/doi/full/10.1098/rsbl.2013.0057

Видео Mystery of the Spiral Tooth 'Shark' канала Moth Light Media