西域鱼在江西和塔里木盆地志留系的新发现  

New findings of Xiyuichthys(Xiushuiaspidae,Galeaspida)from the Silurian of Jiangxi Province and Tarim Basin

作　　者：山显任 林翔鸿 张雨萌 李旭彤 盖志琨[1,2] SHAN Xian-Ren;LIN Xiang-Hong;ZHANG Yu-Meng;LI Xu-Tong;GAI Zhi-Kun(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;University of Chinese Academy of Sciences,Beijing 100049;Yunnan Key Laboratory for Palaeobiology,Institute of Palaeontology,Yunnan University,Kunming 650500;College of Life Sciences,Jiangxi Normal University,Nanchang 330022)

机构地区：[1]中国科学院古脊椎动物与古人类研究所,中国科学院脊椎动物演化与人类起源重点实验室,北京100044 [2]中国科学院大学,北京100049 [3]云南大学古生物学院,云南省古生物重点实验室,昆明650500 [4]江西师范大学生命科学学院,南昌330022

出　　处：《古脊椎动物学报（中英文）》2023年第4期245-260,共16页Vertebrata Palasiatica

基　　金：国家自然科学基金(批准号:41972006,42072026)资助。

摘　　要：描述了盔甲鱼亚纲修水鱼科西域鱼属在中国志留系的新发现,包括江西九江清水组的一新种——澧溪西域鱼(Xiyuichthys lixiensis sp.nov.)和新疆塔里木盆地塔塔埃尔塔格组的张氏西域鱼(X.zhangi)新材料。澧溪西域鱼的典型特征为:部分头甲侧缘呈锯齿状;头甲纹饰由极为粗大的瘤状突起组成(每平方毫米仅有1个突起)。赣西北志留纪早期生物地层序列较为完整,可以建立标准剖面,为华南和塔里木板块志留纪浅海红层的对比提供参照。因此,澧溪西域鱼在赣西北志留系下红层清水组中的发现具有重要的生物地层意义。该种能和塔里木盆地塔塔埃尔塔格组中的张氏西域鱼直接对比,进一步支持塔里木板块的塔塔埃尔塔格组和华南板块的志留系下红层之间的对应关系。化石记录显示,修水鱼科具有较长的地层延限,但在不同的层位显示出不同的组成面貌,其中西域鱼属和长兴鱼属出现在志留系下红层(清水组、唐家坞组和塔塔埃尔塔格组),修水鱼属则出现在志留系上红层(西坑组)。New findings of the early Silurian Xiyuichthys(Xiushuiaspidae,Galeaspida),Xiyuichthys lixiensis sp.nov.and X.zhangi are described from the Qingshui Formation in Jiangxi Province and the Tataertag Formation in Tarim Basin respectively.X.lixiensis sp.nov.is characterized by the partially serrated lateral margin of the headshield and the ornamentation composed of extremely coarse granular tubercles(one tubercle per square millimetre).The complete early Silurian biostratigraphic sequence in northwestern Jiangxi warrants the erection of a standard section for the correlation of Silurian shallow marine red beds in South China and Tarim blocks.Thus,the finding of X.lixiensis from the Qingshui Formation(Silurian Lower Red Beds)in Jiujiang of Jiangxi bears important biostratigraphic significance.It can directly compare to X.zhangi from the Tataertag Formation in Tarim Basin on the specific level,which corroborates the correlations between the Tataertag Formation in Tarim Block and the Silurian Lower Red Beds in South China.Fossil records suggest that Xiushuiaspidae have a relatively broader stratigraphic range,but exhibit distinct composition at different stratigraphic horizons,with Xiyuichthys and Changxingaspis arising in the Silurian Lower Red Beds(Qingshui,Tangchiawu,and Tataertag formations)and Xiushuiaspis occurring in the Silurian Upper Red Beds(Xikeng Formation).

关 键 词：赣西北 塔里木盆地 志留纪早期 清水组 塔塔埃尔塔格组 盔甲鱼类 生物地层 

分 类 号：Q915.861[天文地球—古生物学与地层学]