滇东曲靖地区早泥盆世真盔甲鱼科一新属种
Xitunaspis,a new eugaleaspid fish(Eugaleaspiformes,Galeaspida)from the Lower Devonian of Qujing,Yunnan
摘要
Abstract
A new genus and species of the family Eugaleaspidae(Eugaleaspiformes,Galeaspida),Xitunaspis magnus gen.et sp.nov.,is described from the Lower Devonian Xitun Formation in Qujing,Yunnan Province,China.The new genus displays the diagnostic characters of the Eugaleaspidae,including a slit-like median dorsal opening,no inner cornual process,developed median dorsal canals,and only three pairs of lateral transverse canals extending from lateral dorsal canals.Different from the other eugaleaspids,X.magnus possesses a large headshield with thick dermal bone and a more plesiomorphic sensory canal system.The phylogenetic analysis of the Galeaspida reveals that Xitunaspis clusters with Dunyu and Eugaleaspis to form a monophyletic clade Eugaleaspidae Liu,1965,and has a closer relationship with Dunyu than Eugaleaspis by sharing the thick dermal bone of the headshield.The new finding represents the first convincing fossil record of the Eugaleaspiformes in the middle Lochkovian Xitun Formation and adds to our knowledge about the morphology of eugaleaspiforms and the evolutionary pattern of the sensory canal system in the Eugaleaspiformes and even Galeaspida.关键词
云南曲靖/早泥盆世/真盔甲鱼类,西屯鱼/感觉管系统Key words
Qujing,Yunnan/Early Devonian/Xitunaspis,Eugaleaspiformes/sensory canal system分类
生物科学引用本文复制引用
孙浩然,盖志琨,蔡家琛,李强,朱敏,赵文金..滇东曲靖地区早泥盆世真盔甲鱼科一新属种[J].古脊椎动物学报,2022,60(3):169-183,15.基金项目
中国科学院战略性先导科技专项(编号:XDB26000000)、国家自然科学基金(批准号:41972006,42072026)、中国科学院前沿科学重点研究计划(编号:QYZDB-SSW-DQC040)和国家高层次人才特殊支持计划(万人计划)资助.We are grateful to Cui Xindong and Peng Lijian for their fieldwork,Lu Xiufen for the specimen preparation,Hou Yemao for the computed tomography scanning and rendering,Feng Mingjuan for illustration(Fig.4B),and Shi Aijuan for the life restoration(Fig.4C).We would also like to thank two anonymous reviewers for their constructive comments on the manuscript.This work was supported by the Strategic Priority Research Program of CAS(XDB26000000),the National Natural Science Foundation of China(41972006,42072026),Key Research Program of Frontier Sciences,CAS(QYZDB-SSW-DQC040),and the National Program for Support of Topnotch Young Professionals. （编号:XDB26000000）
