A Theropod Dinosaur Embryo and the Affinities of the Flaming Cliffs Dinosaur Eggs

  title={A Theropod Dinosaur Embryo and the Affinities of the Flaming Cliffs Dinosaur Eggs},
  author={Mark A. Norell and J. M. Clark and D Demberelyin and B Rhinchen and Luis M Chiappe and Amy R. Davidson and Malcolm C. Mckenna and Perle Altangerel and Michael J. Novacek},
  pages={779 - 782}
An embryonic skeleton of a nonavian theropod dinosaur was found preserved in an egg from Upper Cretaceous rocks in the Gobi Desert of Mongolia. Cranial features identify the embryo as a member of Oviraptoridae. Two embryo-sized skulls of dromaeosaurids, similar to that of Velociraptor, were also recovered in the nest. The eggshell microstructure is similar to that of ratite birds and is of a type common in the Djadokhta Formation at the Flaming Cliffs (Bayn Dzak). Discovery of a nest of such… Expand

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We use the word "embryo" in cases where the fossils are sufficiently preserved to discern that the eggs had been fertilized, but the word "egg" where evidence of development is absent or equivocal
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