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湖南早奥陶世弗洛期的笔石新属——挪威笔石属(Norvegiograptus gen.nov.)

A NEW GRAPTOLITE GENUS NORVEGIOGRAPTUSFROM THE NINGKUO FORMATION(LOWER ORDOVICIAN)OF HUNAN PROVINCE,CHINA

【Author in Chinese】 李丽霞冯洪真王文卉陈文建

【Author】 LI Li-xia;FENG Hong-zhen;WANG Wen-hui;CHEN Wen-jian;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences;School of Earth Sciences and Engineering,Nanjing University;

【Institution】 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大学地球科学与工程学院

【Abstract in Chinese】 报道产自湖南益阳南坝剖面下奥陶统弗洛阶的笔石新属——挪威笔石属(Norvegiograptus gen.nov.),该属归属于均分笔石科(Dichograptidae)对笔石亚科(Didymograptinae),主要特征是第一个胞管(th11)自胎管中部生出,始端发育型式为artus型,笔石体两枝纤细、下斜至下曲伸展。属内包含两个种:Norvegiograptus liber(Monsen)和Norvegiograptus enshiensis(Ni)。

【Abstract】 A new graptolite genus,Norvegiograptus gen.nov.,is documented from the lower to middle Ningkuo Formation(Floian,Lower Ordovician)at Nanba of Yiyang,Hunan Province,central China.The new genus is a dichogratid form characterized by two slender stipes declined to deflexed,the first theca(th11)budding from the middle of the sicula,and the proximal development of artus type with the second theca(th12)as the dicalycal theca.It is assigned to the subfamily Didymograptinae of the family Dichograptidae,with Didymograptus liber Monsen,1937 as type species,including two species,Norvegiograptus liber(Monsen)and Norvegiograptus enshiensis(Ni).

【Keywords in Chinese】 挪威笔石属新属弗洛期早奥陶世湖南
【Key words】 Norvegiograptusnew genusNingkuo FormationLower OrdovicianHunan Province
【Fund】 国家自然科学基金项目(No.41372017,No.41221001,No.41290260);现代古生物学与地层学国家重点实验室(No.143103)资助
  • 【CLC code】Q915
  • 【Downloads】78
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