New findings of Changxingaspis(Xiushuiaspidae,Galeaspida)from the Silurian of Tarim Basin and Zhejiang Province,China  

作　　者：LI Xutong ZHANG Yumeng LIN Xianghong ZHU Min ZHAO Wenjin TANG Lizhou SHAN Xianren GAI Zhikun 

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]College of Life Sciences,Jiangxi Normal University,Nanchang 330022,China [3]Yunnan Key Laboratory for Palaeobiology,Institute of Palaeontology,Yunnan University,Kunming 650500,China [4]University of Chinese Academy of Sciences,Beijing 100044,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第3期531-540,共10页地质学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.92255301,41972006,42072026,42130209);Mee-mann Chang Academician Workstation in Yunnan Province(Grant No.202205AF150002)。

摘　　要：New discovery of the early Silurian fossil fish Changxingaspis(Xiushuiaspidae,Galeaspida),Changxingaspis nianzhongi sp.nov.and C.gui,are described from the Tataertag Formation in Tarim Basin and the Kangshan Formation in Zhejiang Province,respectively.C.nianzhongi mainly differs from C.gui in the shape of the median dorsal opening that is transverse elliptic with a width/length ratio of about 3.0,the long lateral transverse canals extending to the lateral margin of the headshield,and the second lateral transverse canal with dichotomous branchings.Discovery of C.nianzhongi from the Tataertag Formation and C.gui from the Kangshan Formation provide direct evidence on the specific level for the correlation between these two formations,which further supports the Silurian fish-bearing red beds in northwest Zhejiang belonging to the Silurian Lower Red Beds(LRBs)rather than the Upper Red Beds(URBs).Additionally,as the first record of the Changxingaspis in Tarim Basin,it extends the paleogeographical distribution of this genus from the South China Block to the Tarim Block,providing new evidence to support faunal exchanges between these two blocks and the hypothesis of a united Tarim-South China Block during the early Silurian.

关 键 词：vertebrate paleontology Galeaspids Changxingaspis new taxon Tataertag Formation Kangshan Formation Aeronian-Telychian TARIM Zhejiang 

分 类 号：Q915[天文地球—古生物学与地层学]