PLOS ONE2013-11-19 1:28 AM

Tyrant Dinosaur Evolution Tracks the Rise and Fall of Late Cretaceous Oceans “暴力之王”(霸王龙近亲)的进化史记载了白垩纪晚期海洋平面的升降变化

Abstract The Late Cretaceous (~95–66 million years ago) western North American landmass of Laramidia displayed heightened non-marine vertebrate diversity and intracontinental regionalism relative to other latest Cretaceous Laurasian ecosystems. Processes generating these patterns during this interval remain poorly understood despite their presumed role in the diversification of many clades. Tyrannosauridae, a clade of large-bodied theropod dinosaurs restricted to the Late Cretaceous of Laramidia and Asia, represents an ideal group for investigating Laramidian patterns of evolution. We use new tyrannosaurid discoveries from Utah—including a new taxon which represents the geologically oldest member of the clade—to investigate the evolution and biogeography of Tyrannosauridae. These data suggest a Laramidian origin for Tyrannosauridae, and implicate sea-level related controls in the isolation, diversification, and dispersal of this and many other Late Cretaceous vertebrate clades. 摘要翻译 白垩纪晚期(~95-66千万年前)北美洲大陆西部的拉腊米迪亚古陆相对于其他最近期白垩纪劳亚古大陆(板块学说中包括亚,欧,北美的古大陆)生态系统显示出了高度的非海洋脊椎动物多样性和内陆区域性。我们对在此期间隔产生这些模式的过程仍然所知甚少,尽管他们可能扮演着影响许多分支多元化的重要角色。暴龙科,作为仅限分布在白垩纪晚期拉腊米迪亚古陆和亚洲地区的大型兽脚类恐龙分支之一,代表着探索拉腊米迪亚古陆演化模式的理想类群。我们用来自北美犹他洲(包括了一个新的代表着该分支最古老的地质成员之一的分类群)有关暴龙科的最新研究发现来研究暴龙科的进化史和有关它的生物地理学说。这些数据表明拉腊米迪亚古陆是暴龙科的起源地,且揭示了海平面相关变化如何影响该暴龙科类群和其他白垩纪晚期脊椎动物分支类群的隔离,多样性和分散等行为事件。 界/门/纲/总目/目/亚目/总科/科 动物界/脊索动物门/蜥形纲/恐龙总目/蜥臀目/兽脚亚目/暴龙超科/暴龙科 Animalia /Chordata /Sauropsida /Dinosauria /Saurischia /Theropoda /Tyrannosauroidea /Tyrannosauridae

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