anewgenusofeugaleaspidiformsagnathagaleaspidafromtheludlowsilurianofqujingyunnansouthwesternchina
文献类型：期刊论文
| 作者 | Zhu Min ; Liu Yuhai; Jia Liantao; Gai Zhikun
|
| 刊名 | 古脊椎动物学报
 |
| 出版日期 | 2012 |
| 卷号 | 50期号:1页码:1 |
| ISSN号 | 1000-3118 |
| 英文摘要 | 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 |
| 源URL | [http://119.78.100.205/handle/311034/10328]  |
| 专题 | 古脊椎动物与古人类研究所_图书馆1 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 |
| 推荐引用方式 GB/T 7714 | Zhu Min,Liu Yuhai,Jia Liantao,et al. anewgenusofeugaleaspidiformsagnathagaleaspidafromtheludlowsilurianofqujingyunnansouthwesternchina[J]. 古脊椎动物学报,2012,50(1):1. |
| APA | Zhu Min,Liu Yuhai,Jia Liantao,&Gai Zhikun.(2012).anewgenusofeugaleaspidiformsagnathagaleaspidafromtheludlowsilurianofqujingyunnansouthwesternchina.古脊椎动物学报,50(1),1. |
| MLA | Zhu Min,et al."anewgenusofeugaleaspidiformsagnathagaleaspidafromtheludlowsilurianofqujingyunnansouthwesternchina".古脊椎动物学报 50.1(2012):1. |
入库方式： OAI收割
来源：古脊椎动物与古人类研究所
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