内蒙古鄂尔多斯地区早白垩世罗汉洞组剑龙类新材料

发布时间：2018-01-01 21:21

本文关键词：内蒙古鄂尔多斯地区早白垩世罗汉洞组剑龙类新材料　出处：《中国地质科学院》2017年硕士论文　论文类型：学位论文

【摘要】：剑龙类是有排列骨板的有甲类恐龙,它的特征主要有:头相对较小,颈部至尾部的背面长有骨板,四足行走,背椎椎弓明显高于相应的椎体。剑龙类是中侏罗世-早白垩世的一类爬行动物,它们被分为剑龙科(Stegosauridae)和华阳龙科(Huayangosauridae)。鄂尔多斯盆地早白垩世志丹群产出丰富的四足类动物化石:龟类、离龙类、鳄形类、鹦鹉嘴龙类、剑龙类、甲龙类、兽脚类、鸟类和早期哺乳类。采自内蒙古鄂尔多斯志丹群罗汉洞组的剑龙类化石标本,其相关联荐椎和肠骨、背椎和肩胛骨的形态特征显示其可被归为鄂尔多斯乌尔禾龙(Wuerhosaurus ordoserasis)。该标本解剖学研究表明鄂尔多斯乌尔禾龙还具有以下特征:上髋臼面前缘向后凹而后缘内侧更加内凹;肩胛骨骨干向远端扩展;骨棘基部中间宽度最大,向前后向延伸变窄,横截面大致呈菱形,骨棘不对称,骨棘基部宽度最大,向背向逐渐窄收缩。鄂尔多斯乌尔禾龙(Wuerhosaurus ordsensis)和新疆准噶尔盆地的平坦乌尔禾龙(Wuerhosaurus homheni)存在明显区别:(1)鄂尔多斯乌尔禾龙肠骨前突延伸较短,肠骨前突背缘向后逐渐向背侧拱曲、高度逐渐加大;而平坦乌尔禾龙肠骨前突后端背腹缘大致平行;(2)鄂尔多斯乌尔禾龙上髋臼面相对较小;(3)鄂尔多斯乌尔禾龙左右肠骨前突延伸方向与中轴线之间的夹角略小于平坦乌尔禾龙的;(4)鄂尔多斯乌尔禾龙的肩胛骨骨干向远端扩展,平坦乌尔禾龙肩胛骨骨干远端背腹缘近似平行。(5)鄂尔多斯乌尔禾龙的肩峰突呈三角形,平坦乌尔禾龙的肩峰突呈矩形。这些区别进一步表明鄂尔多斯乌尔禾龙和平坦乌尔禾龙是不同的种。亚洲北部早白垩世存在鹦鹉嘴龙动物群,主要分布在我国北方的辽宁、内蒙古、甘肃、山东、新疆等地。经过对比发现,内蒙古鄂尔多斯地区、新疆准噶尔盆地和甘肃马鬃山地区早白垩世脊椎动物群存在一定的联系,内蒙古鄂尔多斯地区早白垩世脊椎动物群与新疆准噶尔盆地早白垩世脊椎动物群关系比甘肃马鬃山早白垩世脊椎动物群关系更密切。
[Abstract]:Stegosaurus is a kind of dinosaur with arranged bone plates. It is characterized by a relatively small head, a bone plate on the back of the neck to the tail, and a four-legged walk. The dorsal pedicle is obviously higher than the corresponding vertebrate. The phlogid is a kind of reptile from the Middle Jurassic to the early Cretaceous. They are divided into two groups: Stegosauridaeae and Huayangosauridaeae). The early Cretaceous Zhidan Group in Ordos Basin is rich in tetrapods: tortoises. Dioscodon, alligator, Psittacosaurus, stegosaurus, Archaeosaurus, Zoopod, Birds and early mammals. Fossilized specimens of Xerosaurus from Luo Han Cave formation, Ordos, Inner Mongolia, are associated with sacral vertebrae and intestinal bone. The morphological features of the dorsal vertebrae and scapula indicate that they can be classified as Ordos Wuerhosaurus Wuerhosaurus ordoserasis. The anatomical study of the specimen shows that Ordos Wuerhosaurus also has the following characteristics: the anterior edge of the acetabulum is more concave to the medial side of the posterior margin of the posterior concave; The scapular diaphysis extended to the distal end; The middle width of bone spine is the largest, and the extension is narrower. The cross section is rhomboid, the bone spine is asymmetrical, and the base width of bone spine is the largest. The backward direction gradually narrows. Ordos Wuerhosaurus Wuerhosaurus ordsensisand flat Wuerhosaurus in the Junggar Basin, Xinjiang. Wuerhosaurus homheni1) there was a significant difference between the two groups.) Wuerhosaurus had a short extension of the anterior protrusion of the intestine in Ordos. The dorsal margin of the anterior processus of the intestine gradually curved back to the dorsal side, and the height gradually increased. The posterior dorsal ventral margin of the flat Wuerhosaurus's intestinal protrusion was approximately parallel. 2) the acetabular surface of Wuerhosaurus in Ordos is relatively small; (3) the angle between the extension direction of the left and right anterior protrusion of the intestine and the central axis of Wuerhosaurus in Ordos is slightly smaller than that of the flat Wuerhosaurus. (4) the scapular diaphysis of Wuerhosaurus in Ordos extends to the distal end, and the distal dorsal ventral margin of Wuerhosaurus is approximately parallel. 5) the acromion process of Wuerhosaurus in Ordos is triangular. The flat Wuerhosaurus's acromions are rectangular. These differences further indicate that Wuerhosaurus and flat Wuerhosaurus are different species. Wuerhosaurus fauna existed in the early Cretaceous in northern Asia. Mainly distributed in Liaoning, Inner Mongolia, Gansu, Shandong, Xinjiang and other places in the north of China. The early Cretaceous vertebrate flora in the Junggar Basin of Xinjiang and the Magonaishan area in Gansu Province is related to some extent. The relationship between the early Cretaceous vertebrate flora and the early Cretaceous vertebrate group in the Ordos area of Inner Mongolia is closer than that of the early Cretaceous vertebrate group in the Manongshan Mountains of Gansu Province.
【学位授予单位】：中国地质科学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q915

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