A newly discovered Helicoprion specimen from the Patlanoaya Formation, State of Puebla, represents the southernmost finding of this genus of edestoid-shark in the Western Hemisphere. It was found in sediments assigned to the upper part of the Early Permian, based on its association with Perrinites hilli, an index ammonoid for the Leonardian age.

Since the first description of this enigmatic Permian shark by Karpinsky in 1899, the genus Helicoprion has been reported from Leonardian sediments, with one exception in Texas, where the age of the fossils corresponds to the Wolfcampian. The regions in which Helicoprion has been found include...

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