A Basal Alvarezsauroid Theropod from the Early Late Jurassic of Xinjiang, China

@article{Choiniere2010ABA,
  title={A Basal Alvarezsauroid Theropod from the Early Late Jurassic of Xinjiang, China},
  author={Jonah N. Choiniere and Xing Xu and James M. Clark and Catherine A. Forster and Yu Guo and Fenglu Han},
  journal={Science},
  year={2010},
  volume={327},
  pages={571 - 574}
}
Big Finger Alvarezsauroidea are an enigmatic group of theropods presumed to be closely related to birds, though most specimens are younger than Archaeopteryx. Choiniere et al. (p. 571; see news story by Stone) now describe a more complete early specimen, dating to about 160 million years ago, which supports the conclusion that Alvarezsauroidea are a basal group of the clade containing both birds and their close theropod relatives. The fossil also helps to reveal the evolution of this group's… 
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