摘要
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)。
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 theea （thl1） budding from the middle of the sicula, and the proximal development of artus type with the second theca （thlz） as the dicalycal theca. It is assigned to the subfamily Didymograptinae of the family Dichograptidae, with Didyrnograptus liber Monsen, 1937 as type species, including two species, Norvegiograptus liber （ Monsen ） and Norvegiograptus enshiensis （Ni）.
出处
《古生物学报》
CAS
CSCD
北大核心
2014年第2期172-179,共8页
Acta Palaeontologica Sinica
基金
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
关键词
挪威笔石属
新属
弗洛期
早奥陶世
湖南
Norvegiograptus, new genus, Ningkuo Formation, Lower Ordovician, Hunan Province
