A new genus of eugaleaspidiforms (Agnatha: Galeaspida) from the Ludlow, Silurian of Qujing, Yunnan, Southwestern China

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	A new genus of eugaleaspidiforms (Agnatha: Galeaspida) from the Ludlow, Silurian of Qujing, Yunnan, Southwestern China
	Zhu Min; Liu Yuhai; Jia Liantao; Gai Zhikun
	2012
发表期刊	古脊椎动物学报
ISSN	1000-3118
卷号	50 期号:1 页码:1-7
摘要	A new genus and species of the Eugaleaspidiformes (Agnatha:Galeaspida),Dunyu longiforus gen.et sp.nov.,is described from the Ludlow (Silurian) Kuanti Formation of Qujing,Yunnan,southwestern China,in association with the oldest near-complete gnathostome Guiyu oneiros of the Xiao-xiang Vertebrate Fauna.The new genus is most suggestive of Eugaleaspis of the Eugaleaspidae by the absence of inner corners,in addition to the diagnostic features of the family,such as only 3 pairs of lateral transverse canals from lateral dorsal canals,and the U-shaped trajectory of median dorsal canals.They differ in that the new genus possesses a pair of posteriorly extending corners,the breadth/length ratio of the shield smaller than 1.1,and the posterior end of median dorsal opening beyond the posterior margin of orbits.Eugaleaspis xiushanensis from the Wenlock Huixingshao Formation of Chongqing is re-assigned to Dunyu,based on the new examination of the type specimen which shows a pair of posteriorly extending lobate corners and three (instead of four in the original description) pairs of lateral transverse canals.The new species differs from Dunyu xiushanensis in its large cephalic shield which is longer than broad,spine-shaped corners,anteriorly positioned orbits,the length ratio between preorbital and postorbital portions of the shield less than 0.75,and large polygonal,flat-topping tubercles exceeding 2.0 mm in length.
语种	英语
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/10329
专题	中科院古脊椎所（2000年以后）中国科学院古脊椎动物与古人类研究所
作者单位	中国科学院古脊椎动物与古人类研究所
第一作者单位	中国科学院古脊椎动物与古人类研究所
推荐引用方式 GB/T 7714	Zhu Min,Liu Yuhai,Jia Liantao,et al. A new genus of eugaleaspidiforms (Agnatha: Galeaspida) from the Ludlow, Silurian of Qujing, Yunnan, Southwestern China[J]. 古脊椎动物学报,2012,50(1):1-7.
APA	Zhu Min,Liu Yuhai,Jia Liantao,&Gai Zhikun.(2012).A new genus of eugaleaspidiforms (Agnatha: Galeaspida) from the Ludlow, Silurian of Qujing, Yunnan, Southwestern China.古脊椎动物学报,50(1),1-7.
MLA	Zhu Min,et al."A new genus of eugaleaspidiforms (Agnatha: Galeaspida) from the Ludlow, Silurian of Qujing, Yunnan, Southwestern China".古脊椎动物学报 50.1(2012):1-7.

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