Modern Turtle Origins: The Oldest Known Cryptodire

  title={Modern Turtle Origins: The Oldest Known Cryptodire},
  author={E. S. Gaffney and J. H. Hutchison and F. Jenkins and L. J. Meeker},
  pages={289 - 291}
  • E. S. Gaffney, J. H. Hutchison, +1 author L. J. Meeker
  • Published 1987
  • Biology, Medicine
  • Science
  • The discovery of a turtle in the Early Jurassic(185 million years before present) Kayenta Formation of northeastern Arizona provides significant evidence about the origin of modern turtles. This new taxon possesses many of the primitive features expected in the hypothetical common ancestor of pleurodires and cryptodires, the two groups of modern turtles. It is identified as the oldest known cryptodire because of the presence of a distinctive cryptodiran jaw mechanism consisting of a trochlea… CONTINUE READING
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