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An exceptional Devonian fish from Australia sheds light on tetrapod origins

机译:来自澳大利亚的特殊泥盆纪鱼类揭示了四足动物的起源

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摘要

The transition from fishes to tetrapods was one of the most dramatic events in the evolution of vertebrates, but many pivotal fossils are incomplete, resulting in gaps in the data that are used for phylogenetic reconstruction. Here we present new observations from the most complete, acid-prepared Devonian tetrapodomorph fish yet discovered, Gogonasus(1,2), which was previously placed just crownward of Kenichthys and rhizodontids(3,4), the most primitive taxa on the tetrapod lineage. Unexpectedly, Gogonasus shows a mosaic of plesiomorphic and derived tetrapod-like features. Whereas the braincase and dermal cranial skeleton exhibit generalized morphologies with respect to Eusthenopteron(5) or Panderichthys(6), taxa that are traditionally considered to be phyletically close to tetrapods(7,8), the presence of a deeply invaginated, wide spiracle, advanced internal spiracular architecture and near-horizontal hyomandibula are specialized features that are absent from Eusthenopteron(9). Furthermore, the pectoral fin skeleton of Gogonasus shares several features with that of Tiktaalik, the most tetrapod-like fish(10). A new phylogenetic analysis places Gogonasus crownward of Eusthenopteron as the sister taxon to the Elpistostegalia. Aspects of the basic tetrapod limb skeleton and middle ear architecture can now be traced further back within the tetrapodomorph radiation.
机译:从鱼类到四足动物的过渡是脊椎动物进化过程中最引人注目的事件之一,但是许多关键化石都不完整,导致用于系统发育重建的数据存在缺口。在这里,我们从尚未发现的最完整,酸制备的泥盆纪四足动物鱼类Gogonasus(1,2)中提出新的观察结果,该鱼类先前被放置在Kenichthys和Rhizodontids(3,4)的最顶端,这是四足动物谱系中最原始的分类群。出乎意料的是,Gogonasus呈现出一种多形和衍生的四足动物样特征的镶嵌体。相对于传统上被认为在进化上接近四足动物(7,8)的Eusthenopteron(5)或Panderichthys(6)而言,脑箱和真皮颅骨骨架表现出普遍的形态,但存在深深的内陷,宽阔的螺旋体, Eusthenopteron(9)缺乏先进的内部螺旋形结构和近水平的玻璃纤维膜异位症(hypoandibula)。此外,Gogonasus的胸鳍骨架与Tiktaalik一样具有一些特征,Tiktaalik是最像四足动物的鱼(10)。一项新的系统发育分析表明,Eusthenopteron的Gogonasus冠冕成为Elpistostegalia的姊妹分类群。基本四足动物肢体骨骼和中耳结构的各个方面现在可以追溯到四足动物辐射内。

著录项

  • 来源
    《Nature》 |2006年第7116期|p. 199-202|共4页
  • 作者单位

    Museum Victoria, Melbourne, Vic 3001, Australia;

    Australian Natl Univ, Dept Earth & Marine Sci, Canberra, ACT 0200, Australia;

    Monash Univ, Sch Geosci, Clayton, Vic 3800, Australia;

    Australian Natl Univ, Res Sch Phys Sci, Dept Appl Math, Canberra, ACT 0200, Australia;

  • 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
  • 中图分类 自然科学总论;
  • 关键词

    PALEONTOLOGY;

    机译:古生物学;

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