| 贵州晚三叠世安顺龙（爬行纲：海龙目）一新种 |
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| 引用本文： | 程龙,陈孝红,王传尚.贵州晚三叠世安顺龙（爬行纲：海龙目）一新种[J].地质学报,2007,81(10):1345-1351. |
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| 作者姓名： | 程龙 陈孝红 王传尚 |
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| 作者单位： | 宜昌地质矿产研究所,湖北宜昌,443003 |
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| 基金项目： | 中国地质调查局工作项目“关岭生物群的起源、演化与古生态特征”(编号1212010611603)资助成果 |
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| 摘 要： | 本文系统描述了海龙类安顺龙属的一个新种——黄泥河安顺龙(Anshunsaurus huangnihensissp.nov.)。新种采自贵州省兴义市乌纱镇谢米村上三叠统竹竿坡组底部。它与邻区发现的晚三叠世黄果树安顺龙(A.huangguoshuensis)和乌纱安顺龙(A.wushaensis)相比,存在如下相似之处:轭骨呈三射形;荐前椎都约为38枚;颈椎约17枚;趾式为2-3-4-5-4。但是,新种与后两者之间最大的区别是:新种的乌喙骨前缘向前延伸较短,而后腹缘向后延伸较远,而后者的情况刚好相反。新种的乌喙骨的特征与在欧洲发现的中三叠世Askeptosaurus italicus和晚三叠世诺利期Endennasaurus acutirostris的较为相近。以上特征指示新种可能为A.italicus和A.huangguoshuensis的过渡类型。这为长颈型海龙类的系统演化和古地理分布提供重要的证据。
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| 关 键 词： | 海龙 三叠纪 贵州 |
| 修稿时间： | 2007-05-28 |
A New Species of Late Triassic Anshunsaurus (Reptilia:Thalattosauria) from Guizhou Province |
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| CHENG Long,CHEN Xiaohong,WANG Chuanshang.A New Species of Late Triassic Anshunsaurus (Reptilia:Thalattosauria) from Guizhou Province[J].Acta Geologica Sinica,2007,81(10):1345-1351. |
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| Authors: | CHENG Long CHEN Xiaohong WANG Chuanshang |
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| Institution: | Yichang Institute of Geology and Mineral Resources, Yichang , Hubei , 443003 |
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| Abstract: | Anshunsaurus huangnihensis sp.nov.,described in this article,was erected from the early Late Triassic limestone in Xingyi County,Guizhou Province.It is very similar to Anshunsaurus huangguoshuensis and A.wushaensis in such features as tri-radiate jugal,about 38 presacral vertebrae and 17cervical vertebrae,the formula of phalange being 2-3-4-5-4.However,the distinct differences among them are that the anterior margin of coracoid of the new species is slightly shorter,and the posterior margin extends longer postoventrally.The characters are very similar to those of Askeptosaurus italicus from Grenzbitumenzone(Anisian/Ladinian)and Endennasaurus acutirostris from Norian in Europe.All these features suggest that the new species belongs to transitional species between A.italicus and A.huangguoshuensis and provides important evidences for the evolution of the long-necked thalattosaur phylogenetics and paleobiography. |
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| Keywords: | Thalattosaur Late Triassic Guizhou |
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