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Ajaw- dropping fossil fish

机译:掉落的化石鱼

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摘要

Jawed vertebrates, or gnathostomes, comprise the vast majority of backboned animals. Understanding their great success and the evolution of their anatomical marvels lies in reconstructing the nature of their most recent common ancestor. An entrenched assumption of classical comparative anatomy, which has gained some recent palaeontologi-cal support, is that this precursor resembled a shark. This hypothesis implies that the anatomical peculiarities of bony fishes - the group that would eventually give rise to ourselves -are specializations that arose later in vertebrate evolutionary history. On page 188 of this issue, Zhu et al. present a 419-million-year-old fossil and accompanying analysis that turn this view on its head. The deepest split in the family tree of modern gnathostomes divides the cartilaginous fishes (chondrichthyans, which include sharks, rays and ratfishes) from the much more species-rich bony fishes (osteichthyans, comprising ray-finned fishes, lungfishes, coelacanths and terrestrial vertebrates).
机译:下颚的脊椎动物或gnastostomes构成了大多数脊椎动物。了解它们的巨大成功以及它们在解剖学上的奇迹的演变,在于重构他们最近的共同祖先的本质。一个经典的比较解剖学的根深蒂固的假设得到了最近的古生物学支持,即该前体类似于鲨鱼。这种假设暗示着,骨鱼的解剖学特性-最终会导致我们自我发展的群体-是脊椎动物进化史上后来出现的专门化学科。在本期的第188页上,Zhu等人。提出了一个拥有4.19亿年历史的化石及其伴随的分析,使这一观点浮出水面。现代咬虫科的家谱中最深的裂痕将软骨鱼类(软骨鱼类,包括鲨鱼,rays鱼和rat鱼)与物种丰富得多的骨鱼(软骨鱼类,包括鳍片鱼,肺鱼,腔棘鱼和陆生脊椎动物)分开。 。

著录项

  • 来源
    《Nature》 |2013年第7470期|175-177|共3页
  • 作者单位

    Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK;

    Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, UK;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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