A New Ctenochasmatid Pterosaur from the Early Cretaceous of Liaoning Province
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A New Ctenochasmatid Pterosaur from the Early Cretaceous of Liaoning Province
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    摘要:

    1 IntroductionCtenochasmatid pterosaurs are characterized by theanterior end of rostrum dorsoventrally compressed androunded, teeth project laterally from the dental border of therostrum at least in the anterior part of the dentition(Wellnhofer, 1970, 1978; Unwin, 2003). Somectenochasmatids have extremely elongated rostrum and thedentition is formed by a great deal of long and slender teeth,e.g., Ctenochasma has over 150 teeth (Kellner, 2003),Gnathosaurus has 130 less densely arranged teeth,…

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    Based on a nearly complete lower jaw from the Early Cretaceous of Liaoning Province, a new ctenochasmatid pterosaur: Liaoxipterus brachyognathus gen. et sp. nov. is erected. Liaoxipterus brachyognathus is different from any known pterosaurs with skulls preserved from western Liaoning Province and its peripheral areas in that the anterior part of the mandibular symphysis is expanded, being widest between the fourth alveolus of each side. Liaoxipterus brachyognathus is assigned to Ctenochasmatidae based on the following characters: the rounded anterior end of the lower jaw is spatulated and dorsoventrally flattened and marked heterodonty in the dentition is absent. It differs from other ctenochasmatid pterosaurs in having relatively small number of teeth. Liaoxipterus is distinguished from some ornithocheirids, which have expanded anterior parts of the mandibular symphyses, such as Anhanguera piscator, Coloborhynchus robustus in which the teeth of the new pterosaur are not as variable.

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DONG Zhiming and lv Junchang Research Center of Paleontology and Stratigraphy, Jijin University, Changchun, Institute of Paleontology and Paleoanthropology, Chinese Academy Sciences, Beijing Institute of Geology, Chinese Academy of Geological Sciences, Beijing ,.2005. A New Ctenochasmatid Pterosaur from the Early Cretaceous of Liaoning Province[J]. ACTA GEOLOGICA SINICA(English edition),79(2):

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