湖南益阳早、中奥陶世的叶笔石属(Phyllograptus)  

EARLY-MIDDLE ORDOVICIAN GRAPTOLITE PHYLLOGRAPTUS FROM THE YIYANG AREA,HUNAN PROVINCE

作　　者：李丽霞 冯洪真[3] 王文卉 LI Li-xia;FENG Hong-zhen;WANG Wen-hui(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing210008,China;Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing210008,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing210046,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,School of Geosciences and Info-Physics,Central South University,Changsha410083,China)

机构地区：[1]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008 [2]中国科学院生物演化与环境卓越创新中心,南京210008 [3]南京大学地球科学与工程学院,南京210046 [4]有色金属成矿预测与地质环境监测教育部重点实验室,中南大学地球科学与信息物理学院,长沙410083

出　　处：《古生物学报》2019年第4期475-486,共12页Acta Palaeontologica Sinica

基　　金：国家自然科学基金项目(41702005,41521061);中国科学院战略性先导科技专项(XDB26000000)联合资助。

摘　　要：报道湖南益阳早、中奥陶世的叶笔石1属5种,包括Phyllograptus anna Hall,1865,Phyllograptus anna longus Ruedemann,1947,Phyllograptus anna ultimus Ruedemann,1904,Phyllograptus claviger Monsen,1937,Phyllograptus claviger acuminatus(Chen and Xia),1979。研究表明,该属主要产出于弗洛晚期至大坪中期,在早、中奥陶世笔石多样性演变事件第一阶段的后期(Corymbograptus deflexus带),叶笔石所代表的上攀伸展类型就已萌芽,且在第二阶段(Pseudophyllograptus angustifolius elongatus带-Isograptus victoriae divergens带)于均分笔石动物群中占据优势地位,对该动物群内部类群的演替起着承前启后的作用,同时也验证了笔石动物群自身的演替对于其多样性演变具有重要影响。Five species of Early-Middle Ordovician graptolite genus Phyllograptus are reported from the Nanba section in the Yiyang area, Hunan Province,South China,including Phyllograptus anna Hall,1865,P.anna longus Ruedemann,1947,P.anna ultimus Ruedemann,1904,P.claviger Monsen, 1937, and P. claviger acuminatus(Chen and Xia),1979.This study indicates that Phyllograptus is distributed in the interval from the upper Floian to the middle Dapingian of Ordovician.As the early indicator of graptolite with scandent stipes,this genus first appeared at the end of the first phase(Corymbograptus deflexus Biozone)of graptolite diversification during the Early-Middle Ordovician,and became increasingly dominant in the Dichograptid fauna during the second phase(Pseudophyllograptus angustifolius elongatus Biozone-Isograptus victoriae divergens Biozone),directly affected the replacement between different groups within the Dichograptid fauna,implying that the evolution within the Dichograptid fauna significantly contributed to the graptolite diversification during the Early-Middle Ordovician.

关 键 词：叶笔石属 早、中奥陶世 湖南益阳 华南 

分 类 号：Q915[天文地球—古生物学与地层学] P534.42[生物学—古生物学]