A New Family of Galeaspids (Jawless Stem-Gnathostomata) from the Early Silurian of Chongqing, Southwestern China
Author:
  • CHEN Yang

    CHEN Yang

    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
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  • GAI Zhikun

    GAI Zhikun

    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 5 CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, China
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  • LI Qiang

    LI Qiang

    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 3 Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China 6 Qujing Normal University, Qujing, Yunnan 655000, China
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  • WANG Jianhua

    WANG Jianhua

    6 Qujing Normal University, Qujing, Yunnan 655000, China
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  • PENG Lijian

    PENG Lijian

    6 Qujing Normal University, Qujing, Yunnan 655000, China
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  • WEI Guangbiao

    WEI Guangbiao

    7 Chongqing Institute of Geological Survey, Chongqing 401122, China
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  • ZHU Min

    ZHU Min

    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 5 CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, China
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Fund Project:

We thank Zhu You’an for the discussion, Zhang Ruigang, Zhou Zhengda, Nie Lei, Li Wei, Cui Zhiwei for their help during the geological field work, and Yang Dinghua for drawing the life restoration. This work was 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), and the Mineral Resources Protection and Supervision Project: Evaluation and Survey of the Silurian Fish Fossil Resources of Youxiu Fold Belt, Chongqing.

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    摘要:

    Abstract:

    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.

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CHEN Yang, GAI Zhikun, LI Qiang, WANG Jianhua, PENG Lijian, WEI Guangbiao, ZHU Min.2022. A New Family of Galeaspids (Jawless Stem-Gnathostomata) from the Early Silurian of Chongqing, Southwestern China[J]. ACTA GEOLOGICA SINICA(English edition),96(2):430~439

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  • 收稿日期:2021-10-11
  • 最后修改日期:2022-01-14
  • 在线发布日期: 2022-04-25
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