新疆准噶尔盆地晚侏罗世一新的巨龙型类恐龙

A new titanosauriform dinosaur (Dinosauria: Sauropoda) from Late Jurassic of Junggar Basin,Xinjiang

研究新疆准噶尔盆地奇台地区晚侏罗世石树沟组一接近完整的蜥脚类恐龙右侧股骨,发现其不仅具有典型巨龙型类恐龙特征,而且还有许多独具特征,如经过股骨近端的侧向膨大部分最远点的实际延伸直线与股骨头背面实际延伸直线成约127°夹角;第四转子发育明显,侧视呈土丘状;第四转子位于股干中间偏上靠近内侧;髁间凹发育呈“U”型;远端关节面与骨干间有一小的夹角。虽然只有股骨保存,但根据特征对比及地层时代和地理分布因素,其代表了一种新的大型巨龙型类恐龙,故建立新属新种:奇台傅山龙(Fushanosaurus qitaiensis gen.et sp.nov.)。

A complete right femur was unearthed from Late Jurassic Shishugou Formation,Qitai area of Junggar Basin,Xinjiang,which not only possesses typical titanosauriformes characteristics,but also some unique characteristics.The angle between the virtually extensional line of the most lateral bulge edge and the dorsally extensional line of the femoral head is about 127°;the fourth trochanter is well developed and mound-shaped in lateral view;the fourth trochanter is located more proximally above the midpoint of the femur shaft and close to the inner side;the intercondyloid fossa is deep and U-shaped;the combined joint surfaces of the distal condyles is orthogonal to the long axis of the femoral shaft.Based on the unique anatomical characters,the comparisons with other titanosauriform femora discovered in China,and its geological and geographical distributions,the authors consider it as a new gigantic titanosauriform dinosaur and name as a new taxon Fushanosaurus qitaiensis gen.et sp.nov.