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Morphogenetic Approach to the Formation of Paired Limbs in the Course of Tetrapodization

机译:四足动物化过程中成对肢体形成的形态学方法

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摘要

Transition from sarcopterygians to tetrapods is analyzed based on new paleontological, ontoge-netic, and molecular data. It is shown that transformation of skeletal fin elements into the tetrapod limb followed the patterns of divergent, parallel, and mosaic development. Morphogenetic plasticity and autonomy of these processes as well as the same developmental bauplan for the limbs of Urodela and Anura are proposed. Variations observed in these processes are regarded as a result of larval adaptations and heterochronies. The latter excludes recapitulation of successive archetypical states (transformation-development of the fish fin into tetrapod limb). The idea that the digits are a novelty relative to the distal radials of the fin is supported.
机译:基于新的古生物学,本体论和分子数据,分析了从翼翅目到四足动物的过渡。结果表明,骨骼鳍元素向四足动物肢体的转化遵循发散,平行和镶嵌发育的模式。这些过程的形态发生可塑性和自主性,以及Urodela和Anura的四肢相同的发育性bauplan被提出。在这些过程中观察到的变化被认为是幼虫适应和异时性的结果。后者不包括重现连续的原型状态(鱼翅向四足动物肢体转化发展)。相对于鳍的远侧the骨,手指是新颖的想法得到了支持。

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  • 来源
    《Biology Bulletin》 |2009年第2期|139-147|共9页
  • 作者

    E. I. Vorobyeva;

  • 作者单位

    Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia;

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