Fossilized dinosaur tooth of a Zapsalis or Acheroraptor showing pronounced ridges running down the tooth.

A dinosaur tooth of the theropod tooth taxon cf. Zapsalis sp. from the Hell Creek Formation in Powder River County, Montana, USA. It's likely Acheroraptor based on similar teeth from Velociraptor and Saurornitholestes.

#dinosaur #fossil #paleontology #zapsalis #acheroraptor #dromaeosaurid #theropod