Early Middle Jurassic vertebrate microremains from the Three Gorges area,southern China |
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| Authors: | Qinghua Shang Gilles Cuny Lide Chen |
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| Institution: | 1. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Science , Beijing, People's Republic of China shangqinghua@ivpp.ac.cn;3. Natural History Museum of Denmark, University of Copenhagen , Copenhagen, Denmark;4. Yichang Institute of Geology and Mineral Resources , Yichang, People's Republic of China |
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| Abstract: | Vertebrate microremains were collected from the Middle Jurassic freshwater deposits of the Lower Member of the Xietan Formation in the Three Gorges area, Hubei Province, People's Republic of China. They include remains of hybodont sharks (Hybodus aff. “H.” parvidens, Hybodus sp., cf. Parvodus sp., Polyacrodus sp. and Hubeiodus ziguiensis gen. et sp. nov.), an actinopterygian fish, and a crocodyliform. The diversity of hybodont sharks in the Xietan Formation and the appearance of a peculiar pattern of tooth morphology in Hubeiodus ziguiensis suggest the adaptive radiation of these sharks in freshwater systems in China during the Middle Jurassic. This diversification led to the rich endemic hybodont faunas of the Lower Cretaceous in Asia. |
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| Keywords: | Actinopterygii China Crocodylomorpha Elasmobranchii Middle Jurassic Three Gorges |
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