武汉志留纪兰多维列世盔甲鱼类新材料  

New Material of Galeaspids from the Silurian Llandovery in Wuhan of South China

作　　者：刘一龙 黄烈斌 纵瑞文[2] 龚一鸣[1,2] Liu Yilong;Huang Liebin;Zong Ruiwen;Gong Yiming(School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074

出　　处：《地球科学》2021年第9期3307-3320,共14页Earth Science

基　　金：国家自然科学基金项目(Nos.41702006,41872034,41290260);大学生创新创业项目(No.201910491084).

摘　　要：汉阳鱼作为湖北武汉地区古生代鱼类的代表,其真实形态一直未被确定下来,同时关于汉阳鱼目内部的系统发育学关系也只停留在其下两个属种的讨论上,并未对其开展详细的分析讨论.采用形态学和分支系统学的方法,对湖北武汉兰多维列世清水组上部的盔甲鱼类新材料进行了详细研究,建立了汉阳鱼科一新属新种:意外洪山鱼(Hongshanaspis inexpectatus gen.et sp.nov.),同时修订了汉阳鱼属的部分特征.新属以头甲呈宽大于长的梯形和横长的长条形中背孔等特征而归属于汉阳鱼科,同时又以头甲侧缘从眶孔往后逐渐由光滑变为锯齿状,椭圆形的背位眶孔,发育8对侧横管和细小粒状的突起纹饰等特征区别于汉阳鱼科其他属种.分支系统学显示,汉阳鱼目并未组成一个单系类群,其下的汉阳鱼科的属种也并未组成一个单系类群,而是一个多分支形式,但其下的修水鱼科的属种却组成了一个单系类群.相关的相标志表明,相比于锅顶山汉阳鱼,意外洪山鱼生活在水体更深的潮控三角洲环境中.As a representative of the Paleozoic fishes in Wuhan,Hubei Province,Hanyangaspis’s true morphology has not been determined,and the phylogenetic relationship within Hanyangaspidida is only discussed in the two genera,without a detailed analysis and discussion.In this paper,morphological and cladistic methods were used to study the new materials of galeaspids.New findings of galeaspids(Agnatha)including Hongshanaspis inexpectatus gen.et sp.nov.and Hanyangaspis guodingshanensis are described from the upper part of the Qingshui Formation(Telychian,Llandovery)in Wuhan of South China.The new genus belongs to Hanyangaspidae based on the trapezoid shape of the head-shield and transverse slit-like median dorsal opening.It differs from other genera and species of Hanyangaspidae by a gradual change from smooth to serrated lateral margin of the head shield,dorsally positioned and oval orbit,8 lateral transverse canals on each side and evenly fine tubercular ornamentation.The cladistics results show that Hanyangaspidida isn’t a monophyletic group,but the genera and species of Xiushuiaspidae constitute a monophyletic group.Meanwhile the facies markers of the upper part of the Qingshui Formation imply that Hongshanaspis inexpectatus lived in a deeper tidal delta environment compared with Hanyangaspis guodingshanensis.

关 键 词：汉阳鱼目 洪山鱼 清水组 志留系特列奇阶 武汉 地层学 

分 类 号：P52[天文地球—古生物学与地层学]