A gigantic bird-like dinosaur from the Late Cretaceous of China
A gigantic bird-like dinosaur from the Late Cretaceous of China
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DOI：
10.1038/nature05849
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发表时间：
2007-06
期刊：
影响因子：
64.8
通讯作者：
Xing（徐星） Xu;Qingwei Tan;Jianmin Wang;Xijin Zhao;Lin Tan
中科院分区：
文献类型：
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作者：
Xing（徐星） Xu;Qingwei Tan;Jianmin Wang;Xijin Zhao;Lin Tan
在虚骨龙兽脚亚目进化过程中，体型减小的进化趋势沿着鸟类的路线出现，但在许多虚骨龙亚群中都观察到体型增大，其中大型体型不太像鸟类。在这里，我们报道了一种新的非鸟类恐龙，二连巨盗龙，gen。等11 月，来自中国内蒙古晚白垩世伊连大巴苏组。虽然它的体重约为 1,400 公斤，但系统发育分析将这个新分类群定位在偷蛋龙目中，这是一群体重很少超过 40 公斤的小型、有羽毛的兽脚类恐龙。组织学分析表明，巨盗龙获得这种体型的生长速度比北美大型暴龙（如艾伯塔龙和蛇发女妖龙）要快得多。巨盗龙拥有其他恐龙中从未有过的几个显着特征，其后肢骨的比例和比例与其他虚骨龙显着不同，从而增加了恐龙之间的形态多样性。最重要的是，巨大的巨盗龙表现出许多其较小的偷蛋龙类亲戚所不具备的鸟类特征，这与许多其他虚骨龙亚群中看到的进化趋势不同。
An evolutionary trend of decreasing size is present along the line to birds in coelurosaurian theropod evolution,, but size increases are seen in many coelurosaurian subgroups, in which large forms are less bird-like,. Here we report on a new non-avian dinosaur,Gigantoraptor erlianensis, gen. et sp. nov., from the Late Cretaceous Iren Dabasu Formation of Nei Mongol, China. Although it has a body mass of about 1,400 kg, a phylogenetic analysis positions this new taxon within the Oviraptorosauria, a group of small, feathered theropods rarely exceeding 40 kg in body mass,,,,. A histological analysis suggests thatGigantoraptorgained this size by a growth rate considerably faster than large North American tyrannosaurs such asAlbertosaurusandGorgosaurus.Gigantoraptorpossesses several salient features previously unknown in any other dinosaur and its hind limb bone scaling and proportions are significantly different from those of other coelurosaurs,, thus increasing the morphological diversity among dinosaurs. Most significantly, the giganticGigantoraptorshows many bird-like features absent in its smaller oviraptorosaurian relatives, unlike the evolutionary trend seen in many other coelurosaurian subgroups,.