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Origin and Early Diversification of Jawed Vertebrates

机译:下颚脊椎动物的起源和早期多样化

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摘要

Gnathostomes,or jawed vertebrates,can be divided into four major clades:the Placodermi,the Acanthodii,the Chondrichthyes (cartilaginous fishes) and the Osteichthyes (actinopterygians and sarcop-terygians).The past two decades have seen the impressive discoveries of primitive gnathostome taxa from the Silurian and Early Devonian,expanding the diversity and disparity in early gnathostome groups.Some of these finds have yielded an unexpected mix of characters for inferring the sequence of character transformation at the base of the Osteichthyes or at the base of the Osteichthyes,thus challenging earlier assumptions and even some of deeply entrenched views about early diversification of gnathostomes,and the rise of osteichthyans from other primitive gnathostomes in particular.Among these finds,the gnathostome remains from the Xiaoxiang Fauna (Ludlow,Silurian) of China definitely push major splits in basal gnathostome evolution out of the Devonian and into the Silurian.
机译:角鼻目或颚状脊椎动物可分为四个主要进化枝:Placodermi,Acanthodii,Chondrichthyes(软骨鱼类)和Osteichthyes(放线目g目和cop目ter目目ians目目)。在过去的二十年间,原始的科目目分类群有了令人印象深刻的发现。来自志留纪和泥盆纪早期,扩大了早期咬钩宿主组的多样性和差异。其中一些发现产生了意想不到的字符组合,可以推断出Osteichthyes底部或Osteichthyes底部的字符转换序列。这些挑战挑战了早期的假设,甚至对早期的食人鱼种类多样化,甚至是一些根深蒂固的观点,尤其是其他原始食人鱼的成骨鱼类的兴起,提出了挑战。在基部gnathostome进化过程中从泥盆纪向志留纪演化。

著录项

  • 来源
    《Darwin's heritage today》|2009年|364|共1页
  • 会议地点 Beijing(CN)
  • 作者

    Min Zhu;

  • 作者单位

    Key Laboratory of Evolutionary Systematics of Vertebrates,Institute of Vertebrate Paleontology and Paleoanthropology(IVPP),Chinese Academy of Sciences,PO Box 643,Beijing 100044,China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 达尔文学说与研究;
  • 关键词

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