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作 者:CHEN Yang GAI Zhikun LI Qiang WANG Jianhua PENG Lijian WEI Guangbiao ZHU Min
机构地区:[1]Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment,Chongqing Institute of Geology and Mineral Resources,Chongqing 401120,China [4]Chongqing Research Center of the State Key Laboratory of Coal Resources and Safe Mining,Chongqing 401120,China [5]CAS Center for Excellence in Life and Paleoenvironment,Beijing 100044,China [6]Qujing Normal University,Qujing,Yunnan 655000,China [7]Chongqing Institute of Geological Survey,Chongqing 401122,China
出 处:《Acta Geologica Sinica(English Edition)》2022年第2期430-439,共10页地质学报(英文版)
基 金:supported by the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDA19050102 and XDB26000000);the National Natural Science Foundation of China(Grant No.41872023);the Key Research Program of Frontier Sciences,CAS(Grant No.QYZDJ-SSW-DQC002);the Mineral Resources Protection and Supervision Project:Evaluation and Survey of the Silurian Fish Fossil Resources of Youxiu Fold Belt,Chongqing。
摘 要:A new genus and species of agnathan Eugaleaspidiformes(Galeaspida), Yongdongaspis littoralis gen. et sp. nov., is described from the Llandovery(lower Silurian) Huixingshao Formation at Yongdong Town, Xiushan County, Chongqing, southwestern China. This new Telychian taxon morphologically exhibits some transitional states between Sinogaleaspidae and a cluster of higher eugaleaspidiforms containing Tridensaspidae, Eugaleaspidae, Yunnanogaleaspis, and Nochelaspis, which we term here as the ’eugaleaspid cluster’. Phylogenetic analysis of an extended character matrix of Galeaspida reveals Yongdongaspis, on which Yongdongaspidae fam. nov. is erected, as the sister taxon of this ’eugaleaspid cluster’, supported by two synapomorphies, the presence of one median transverse canal, and two lateral transverse canals leaving from the infraorbital canal. As the first fish described from the Llandovery Huixingshao Formation in Chongqing, Yongdongaspis provides new fossil evidence for the subdivision and correlation of the Upper Red Beds in South China.
关 键 词:vertebrate paleontology Galeaspida morphology phylogeny TELYCHIAN Chongqing Municipality
分 类 号:P534.43[天文地球—古生物学与地层学] Q915[天文地球—地质学]
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