Named By: X. Xu, J. Choiniere, Q.-W. Tan, R. B. J. Benson, J. Clark, C. Sullivan, Q. Zhao, F.-L. Han, Q.-Y. Ma, Y.-M. He, S. Wang, H. Xing & L. Tan - 2018.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Alvarezsauridae.
Species: X. pengi (type).
Size: Roughly estimated around 2.3 meters long for the holotype.
Known locations: China.
Time period: Barremian/Aptian of the Cretaceous.
Fossil representation: Partial skeleton.
is a genus of alvarezsaurid
dinosaur that lived in China during the
early Cretaceous. In terms of alvarezsaur evolution, Xiyunykus
shows an intermediate development between primitive ancestors and more
Care should be taken not to confuse the Xiyunykus with the similarly named alvarezsaur Xixianykus.
- Two early Cretaceous fossils document transitional stages in alvarezsaurian dinosaur evolution. - Current Biology 28:2853-2860. - X. Xu, J. Choiniere, Q.-W. Tan, R. B. J. Benson, J. Clark, C. Sullivan, Q. Zhao, F.-L. Han, Q.-Y. Ma, Y.-M. He, S. Wang, H. Xing & L. Tan - 2018.