Abstract The Choristodera,an extinct and specialized clade of aquatic-semiaquatic diapsid reptiles,had an evolutionary history in close association with the continental ecosystems of Jurassic through Miocene on northern hemisphere. During the Early Cretaceous in western Liaoning Province of China,choristoderes went through a rapid evolution with diverse ecologic adaptations,as evidenced by their extensive fossil record from the Yixian and Jiufotang Formations. Choristoderan fossils have been found from localities within the Lingyuan,Yixian,Chaoyang and Jianchang areas,with a significant concentration of Hyphalosaurus localited at the Yixian area. The found Choristoderan fossies can be divided into five species of four genera in three families. In terms of geological range,fossils of Hyphalosaurus and Monjurosuchus are simply restricted to the Yixian Formation,while those of Ikechosaurus and Philydrosaurus are confined to the Jiufotang Formation. The extended distribution of the Early Cretaceous choristoderes in western Liaoning indicates a dispersal pattern of the group from west to east and from south to north. And last occurrence of Hyphalosaurus choristoderes in western Liaoning is recorded with thousands of fossil specimens preserved in tuffaceous deposits of the Dakangpu beds of the Yixian Formation. Such an unusual concentration of fossils indicates a possible mass extinction event of this clade during the Early Cretaceous Aptian Age. All choristoderes were wiped out from the western Liaoning during the Early Cretaceous Aptian Age.
About author: Zhang Wei,born in 1989,graduated from the China University of Geosciences(Wuhan)in 2009. He is a master's graduated student at the School of Earth and Space Sciences,Peking University. His thesis research is in the field of paleontology. Tel:15296176469;E-mail:lingyuexiaofeng@126.com. About the corresponding author Gao Ke-Qin,born in 1955,is a professor of paleontology at the School of Earth and Space Sciences,Peking University. His current research focuses on the evolution of amphibians and reptiles based on fossils from the Mesozoic in China. E-mail:kqgao@pku.edu.cn.
Cite this article:
Zhang Wei,Gao Ke-Qin. Early Cretaceous evolution of choristoderes in western Liaoningbased on geographic and stratigraphic evidence[J]. JOPC, 2014, 16(2): 205-216.
Zhang Wei,Gao Ke-Qin. Early Cretaceous evolution of choristoderes in western Liaoningbased on geographic and stratigraphic evidence[J]. JOPC, 2014, 16(2): 205-216.
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