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An Archaeopteryx-tike theropod from China and the origin of Avialae

机译：来自中国的始祖鸟兽脚类兽脚亚目和鸟类的起源

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摘要

Archaeopteryx is widely accepted as being the most basal bird, and accordingly it is regarded as central to understanding avialan origins; however, recent discoveries of derived maniraptorans have weakened the avialan status of Archaeopteryx. Here we report a new Archaeopteryx-Vke theropod from China. This find further demonstrates that many features formerly regarded as being diagnostic of Avialae, including long and robust forelimbs, actually characterize the more inclusive group Paraves (composed of the avialans and the deinonychosaurs). Notably, adding the new taxon into a comprehensive phylogenetic analysis shifts Archaeopteryx to the Deinonychosauria. Despite only tentative statistical support, this result challenges the centrality of Archaeopteryx in the transition to birds. If this new phylogenetic hypothesis can be confirmed by further investigation, current assumptions regarding the avialan ancestral condition will need to be re-evaluated.
机译：始祖鸟被广泛认为是最基础的鸟类，因此被认为是了解鸟类起源的关键。然而，近来衍生的甲虫的发现削弱了始祖鸟的阿瓦兰地位。在这里，我们报告了一种来自中国的新的始祖鸟-Vke节肢动物。这一发现进一步证明，许多以前被认为可以诊断小鸟科的特征，包括长而健壮的前肢，实际上代表了更具包容性的帕拉韦斯族（由鸟类和恐龙组成）。值得注意的是，将新的分类单元添加到全面的系统发育分析中可以将始祖鸟转变为龙爪龙。尽管仅有暂定的统计支持，但这一结果挑战了始祖鸟在向鸟类过渡中的中心地位。如果可以通过进一步的研究证实这一新的系统发育假设，则将需要重新评估有关阿瓦兰祖先状况的当前假设。

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  • 来源
    《Nature》 |2011年第7357期|p.465-470|共6页
  • 作者

    Xing Xu; Hailu You; Kai Du; Fenglu Han;

  • 作者单位

    College of Life Science, Linyi University, Shuangling Road, Linyi City, Shandong 276005, China,Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 142 Xiwai Street, Beijing 100044, China;

    Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;

    Department of Biology, Capital Normal University, 105 Xisanhuan North Road, Beijing 100037, China;

    Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 142 Xiwai Street, Beijing 100044, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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