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首页> 外文期刊>Scientific reports. >New Australian sauropods shed light on Cretaceous dinosaur palaeobiogeography
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New Australian sauropods shed light on Cretaceous dinosaur palaeobiogeography

机译：新的澳大利亚蜥脚类动物揭示了白垩纪恐龙古生物地理学

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Australian dinosaurs have played a rare but controversial role in the debate surrounding the effect of Gondwanan break-up on Cretaceous dinosaur distribution. Major spatiotemporal gaps in the Gondwanan Cretaceous fossil record, coupled with taxon incompleteness, have hindered research on this effect, especially in Australia. Here we report on two new sauropod specimens from the early Late Cretaceous of Queensland, Australia, that have important implications for Cretaceous dinosaur palaeobiogeography. Savannasaurus elliottorum gen. et sp. nov. comprises one of the most complete Cretaceous sauropod skeletons ever found in Australia, whereas a new specimen of Diamantinasaurus matildae includes the first ever cranial remains of an Australian sauropod. The results of a new phylogenetic analysis, in which both Savannasaurus and Diamantinasaurus are recovered within Titanosauria, were used as the basis for a quantitative palaeobiogeographical analysis of macronarian sauropods. Titanosaurs achieved a worldwide distribution by at least 125 million years ago, suggesting that mid-Cretaceous Australian sauropods represent remnants of clades which were widespread during the Early Cretaceous. These lineages would have entered Australasia via dispersal from South America, presumably across Antarctica. High latitude sauropod dispersal might have been facilitated by Albian-Turonian warming that lifted a palaeoclimatic dispersal barrier between Antarctica and South America.
机译：在有关冈瓦纳解体对白垩纪恐龙分布影响的辩论中，澳大利亚恐龙发挥了罕见但有争议的作用。冈瓦南白垩纪化石记录的主要时空空白，加上分类群的不完整，阻碍了对这种影响的研究，特别是在澳大利亚。在这里，我们报告了来自澳大利亚昆士兰晚白垩世早期的两个新蜥脚类动物标本，它们对白垩纪恐龙古生物地理学具有重要意义。大草原龙elliottorum gen。等。十一月包括澳大利亚有史以来最完整的白垩纪蜥脚类动物骨骼，而新的Diamantinasaurus matildae标本包括澳大利亚蜥脚类动物的头颅遗骸。一种新的系统发育分析的结果，其中热带巨蜥和Diamantinasaurus都在Titanosauria中被回收，被用作对大型蜥脚类恐龙进行古生物学地理定量分析的基础。霸王龙至少在1.25亿年前就已经在世界范围内分布，这表明白垩纪中期的澳大利亚蜥脚类恐龙代表了早白垩纪广泛分布的进化枝遗迹。这些血统本来应该通过南美的扩散进入大洋洲的，大概是穿越南极洲的。高纬度蜥脚类动物的散布可能是由Albian-Turonian变暖推动的，该变暖解除了南极和南美之间的古气候散布障碍。

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