True Tailbend Occurred in the Late Triassic: Evidence from Ichthyosaur Skeletons of South China
JI Cheng,JIANG Dayong,HAO Weicheng,SUN Yuanlin,SUN Zuoyu
Acta Scientiarum Naturalium Universitatis Pekinensis . 2011, (2): 209 -314 . 

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