A New Abelisaurid (Dinosauria, Theropoda) from the Lameta Formation (Cretaceous, Maastrichtian) of India
A New Abelisaurid (Dinosauria, Theropoda) from the Lameta Formation (Cretaceous, Maastrichtian) of India
复制标题
DOI：
--
复制
发表时间：
2003-08
期刊：
影响因子：
--
通讯作者：
JEFFREY A. Wilson;P. Sereno;S. Srivastava;D. K. Bhatt;A. Khosla;A. Sahni
中科院分区：
文献类型：
--
作者：
JEFFREY A. Wilson;P. Sereno;S. Srivastava;D. K. Bhatt;A. Khosla;A. Sahni
在印度的白垩纪岩石中发现了许多孤立的恐龙骨骼和牙齿，但相关遗骸却极其罕见。我们报告了在印度西部最新白垩纪岩石中发现的一种新阿贝力龙兽脚类动物的相关颅骨和颅后遗骸。新分类单元的特征是异常拉长的颞上窗孔和独特的正中鼻额突起。颅后元件包括椎骨以及骨盆带和后肢的部分。尤其是髂骨，结构坚固。从印度中部和西部的白垩纪晚期岩石中收集到的大部分大型兽脚亚目动物材料可能属于阿贝力龙科。新的印度物种与马达加斯加的玛君加索龙和南美洲的食肉牛龙的关系比非洲的相关物种更为密切。然而，对这种系统发育模式的古生物地理学解释必须受到这些陆地上缺乏类似年龄的陆地动物区系的影响：马达加斯加和印度几乎不知道前马斯特里赫特白垩世的脊椎动物，而在非洲对后塞诺曼尼阶脊椎动物的采样非常少。
Many isolated dinosaur bones and teeth have been recovered from Cretaceous rocks in India, but associated remains are exceedingly rare. We report on the discovery of associated cranial and postcranial remains of a new abelisaurid theropod from latest Cretaceous rocks in western India. The new taxon is characterized by exceptionally elongated supratemporal fenestrae and a unique median nasofrontal protuberance. Postcranial elements include vertebrae and portions of the pelvic girdle and hind limbs. The ilium, in particular, is robustly constructed. Much of the large-bodied theropod material collected from latest Cretaceous rocks in central and western India may pertain to this abelisaurid. The new Indian species is more closely allied to Majungatholus from Madagascar and Carnotaurus from South America than to related forms on Africa. Paleobiogeographic interpretation of this phylogenetic pattern, however, must be tempered by the lack of terrestrial faunas of similar age on several of these landmasses: pre-Maastrichtian Cretaceous vertebrates are virtually unknown on Madagascar and India, and post-Cenomanian vertebrates are very poorly sampled on Africa.