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by Xu Xing, Corwin Sullivan, Pittman, Choiniere, David Hone, Paul Upchurch, Tan Qingwei, Xiao Dong, Lin Tan and Han Fenglu in 2011. In 2013, an osteological monograph of the genus was published which included a quantitative analysis of alvarezsauroid biogeography. The latter found statistically significant biogeographic reconstructions suggesting a dominant role for sympatric (or 'within area') events, combined with a mix of vicariance, dispersal

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