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峨眉龙属(恐龙:蜥脚类)在重庆云阳中侏罗统沙溪庙组的发现

发表日期:2018-11-15来源:放大 缩小

作者:谭 超,代 辉,贺建军,张 锋,胡旭峰,余海东, 李 宁,魏光飚,
彭光照,叶 勇,张茜楠,任鑫鑫, 尤海鲁

摘要:形态学和比较研究表明重庆云阳普安中侏罗统沙溪庙组下段发现的一个脊椎可被归入蜥脚类恐龙峨眉龙属一未定种。该中部颈椎的椎体凹/腔构造非常发育以致其显得更加中空而不是坚实,同时该椎体的长度(不包括其前关节髁)和其后关节面长度和高度平均值的比值很高(5.05)。其他特征还包括:椎体长度约为脊椎全高的两倍,椎体腹面中嵴发育,椎体前关节突嵴板和前关节突间板以及椎体后关节突嵴板和后关节突间板间分别围成深而长的空隙,后关节突椎体横突凹的上半部内有一窝腔,上关节突长而低,向后延伸超出后关节突关节面,神经棘前三分之一侧面凹陷,前后向长度约为椎体长度的一半。这一发现揭示了峨眉龙新的形态信息,普安恐龙化石点也代表了该属分布的最东缘。 
关键词:重庆普安,沙溪庙组,蜥脚类,峨眉龙属
卷期:第57卷,第2期
 

 

Discovery of Omeisaurus (Dinosauria: Sauropoda) in the Middle Jurassic Shaximiao Formation of Yunyang, Chongqing, China

TAN Chao, DAI Hui, HE Jian-Jun, ZHANG Feng, HU Xu-Feng, YU Hai-Dong, LI Ning,
WEI Guang-Biao, PENG Guang-Zhao , YE Yong
, ZHANG Qian-Nan,  REN Xin-Xin, YOU Hai-Lu

Abstract      A cervical vertebra recovered from the Middle Jurassic Lower Member of the Shaximiao Formation in Town of Puan, Yunyang County, Chongqing is assigned to an species undeterminata of the sauropod dinosaur Omeisaurus based on morphological and comparative study. The centrum of this mid-cervical is much hollower than solider with extremely developed fossa/foramen complex and has a high ratio (5.05) of its anteroposterior length excluding the articular ball divided by the mean value of the posterior articular surface mediolateral width and dorsoventral height. Additional features of this cervical include central length about twice the total vertebral height, a prominent midline keel on the central ventral surface, deep and long cavities bounded by centroprezygapophyseal lamina / intraprezygapophyseal lamina and centropostzygapophyseal lamina / intrapostzygapophyseal lamina, respectively, a coel on the dorsal half of the postzygapophyseal centrodiapophyseal fossa, long prone epipophysis extending beyond the postzygapophysis facet, anteroposteriorly length of the neural spine about half the length of the centrum, and concavities on the anterior one third lateral surface of the neural spine. Therefore, this discovery reveals new morphological information on Omeisaurus, and this Omeisaurus-bearing Puan dinosaur quarry represents the easternmost occurrence of this genus. 
Key words      Chongqing, Puan; Shaximiao Formation; Sauropoda; Omeisaurus 

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