A New Ctenochasmatid Pterosaur from the Early Cretaceous of Liaoning Province  

作　　者：DONGZhiming LUEJunchang 

机构地区：[1]ResearchCenterofPaleontologyandStratigraphy,JilinUniversity,Changchun130026／／InstituteofPaleontologyandPaleoanthropology,ChineseAcademySciences,Beijing100044 [2]InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037

出　　处：《Acta Geologica Sinica(English Edition)》2005年第2期164-167,共4页地质学报（英文版）

摘　　要：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.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.

关 键 词：Liaoxipterus Ctenochasmatidae Jiufotang Formation Early Cretaceous Liaoning Province 

分 类 号：P534.53[天文地球—古生物学与地层学] Q915.86[天文地球—地质学]