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A Bone Bed From the Dawn of the Dinosaurs Has Revealed the Oldest Known Pterosaur Found in North America

  • Smithsonian researchers identified Eotephradactylus mcintireae, a 209-million-year-old pterosaur, in Arizona’s Petrified Forest National Park, the earliest of its kind in North America.
  • Following lab analysis of 2011 excavated jawbone, modern scanning revealed it belonged to a new 209-million-year-old pterosaur species in Arizona.
  • Data confirm the pterosaur is around 209 million years old, gull-sized, able to perch on a shoulder, with tooth wear indicating a fish-based diet.
  • The find fills a crucial fossil record gap before the end-Triassic extinction, revealing coexistence of pterosaurs, turtles, and amphibians, and advancing understanding of early vertebrate ecosystems.
  • More broadly, this discovery captures the transition to modern vertebrate communities, providing insight into pre-extinction ecosystems and the first recorded coexistence of these groups before the end-Triassic extinction.
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Newsweek broke the news in United States on Monday, July 7, 2025.
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