Tooth Plates of Ceratodus(Dipnoi,Ceratodontidae)from the Upper Jurassic Shaximiao Formation of Guang’an,Sichuan Province,China  

作　　者：WANG Zizheng JIANG Xinsheng WANG Xiaobing GAO Jianguo ZHU Sibao 

机构地区：[1]Chengdu Center of China Geological Survey,Chengdu 610081,China [2]Center for Fossil Restoration and Research,Key Laboratory of Northeastern Asia Paleontological Evolution,Ministry of Natural Resource,Chongzhou,Chengdu 611247,China [3]Chongzhou Tianyan Museum,Chongzhou,Chengdu 611247,China [4]College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China

出　　处：《Acta Geologica Sinica(English Edition)》2022年第3期766-775,共10页地质学报（英文版）

基　　金：This work has been funded by the Land and Resources survey project(Grant No.DD20221690 and DD20190524).

摘　　要：Ceratodus is a form genus of ceratodontid lungfishes.Until now,only 14 specimens have been reported from the Mesozoic of China.Detailed measurements and characteristic comparisons based on 15 well-preserved lungfish tooth plates of Ceratodus type,uncovered from the upper member of the Upper Jurassic Shaximiao Formation at Luojiashan,Qianfeng District,Guang'an,Sichuan Province in 2019,allow us to establish a new species,Ceratodus guanganensis sp.nov.,on the basis of its small swollen irregular triangular tooth plate with four low and swollen radial crests on the occlusal surface without denticles.Other specimens from the same locality can be referred to C.szechuanensis and C.youngi.This is the first discovery of Ceratodus in the Guang'an region and represents the fifth Ceratodus fossil site in the Sichuan Basin.The discovery indicates that the climate was hot and arid in the Sichuan Basin during the Late Jurassic,and reveals a tectonic paleogeographic relationship between the Yangtze block in southwestern China and the Kola Basin in northern Thailand.

关 键 词：vertebrate paleontology dipnoans Ceratodus Mamenchisaurus-Fauna Late Jurassic Sichuan Basin 

分 类 号：Q915.2[天文地球—古生物学与地层学]