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Acknowledgements We thank anonymous reviewers for comments on the manuscript, and Dr. Ren Dong and Liu Ming for technical support. This work was supported by the National Natural Science Foundation of China (30670223), and Scientific Research Common Program of Beijing Municipal Commission of Education (KM200710028012).
ZHENG Xiaoting ZHANG Zihui HOU Lianhai.2007. A New Enantiornitine Bird with Four Long Rectrices from the Early Cretaceous of Northern Hebei, China[J]. ACTA GEOLOGICA SINICA(English edition),81(5):703~708
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