Oviraptorosaur anatomy, diversity and ecology in the Nemegt Basin

The interfingering Baruungoyot and Nemegt Formations of Mongolia host an exceptional diversity of oviraptorosaurs that is unique in including members of all three Late Cretaceous families (avimimids, caenagnathids, and oviraptorids). The oviraptorosaurs from the Baruungoyot and Nemegt Formations are reviewed, with a description of a new species of Avimimus. Emended diagnoses are provided for each taxon, including the first diagnosis of Rinchenia...