摘要
记述了四川盆地西南部晚侏罗世上沙溪庙组顶部的中国盗龙型肉食龙类化石材料,并依此建立一新属新种——犍为乐山龙(Leshansaurus qianweiensisgen.et sp.nov.)。它以上枕骨中嵴呈尖峰状,额骨最大长度与最大宽度之比2.4,基蝶骨之基翼骨突细长,环椎间椎体马蹄形,背椎横突相当细长,背椎和荐椎神经棘非常薄,荐椎椎体具有明显的腹嵴,肠骨内侧髋臼缘存在一明显的嵴等特征区别于其他肉食龙类。犍为乐山龙是目前所知四川盆地产出层位最高的肉食龙材料,它的发现扩大了肉食龙类的时代分布和地理分布,对探讨肉食龙类的演化具有重要的意义。
Based on new material from the top of the Late Jurassic Shangshaximiao F Qianwei County, southwestern Sichuan Basin, a new sinraptorid carnosaur Lesha ormatlon nsaurus of Xiaogu, qianweiensis gen. et sp. nov. is erected. It is distinguished from other carnosaurs by supraoccipital with a sharp midline ridge; relatively longer frontal with a ratio of the maximum length to the maximum width about 2. 4; basipterygoid processes of basisphenoid slender; atlantal intercentrum horseshoe-shaped; diapophyses of dorsal vertebrae relatively slender; neural spines of dorsal and sacral vertebrae very thin; ventral keel of sacral vertebrae distinctly defined; ilium with a conspicuous ridge medially along acetabular edge. This new dinosaur was the latest carnosaur presently known in Sichuan Basin. Its discovery extends the horizontal and geographical distributions of the carnosaurs in Sichuan Basin, and is significant in the evolution of the carnosaurs.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2009年第9期1203-1213,共11页
Acta Geologica Sinica
基金
乐山市国土资源局提供资金支持
关键词
四川犍为
上沙溪庙组
晚侏罗世
肉食龙类
Qianwei, Sichuan
Shangshaximiao Formation
Late Jurassic
sinraptorid carnosaur
