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The cranial endoskeleton of Tiktaalik roseae

机译:提克塔利克玫瑰科的颅内骨骼

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摘要

Among the morphological changes that occurred during the 'fish-to-tetrapod' transition was a marked reorganization of the cranial endoskeleton. Details of this transition, including the sequence of character acquisition, have not been evident from the fossil record. Here we describe the braincase, palatoquadrate and branchial skeleton of Tiktaalik roseae, the Late Devonian sarcopterygian fish most closely related to tetrapods. Although retaining a primitive configuration in many respects, the cranial endoskeleton of T. roseae shares derived features with tetrapods such as a large basal articulation and a flat, horizontally oriented entopterygoid. Other features in T. roseae, like the short, straight hyomandibula, show morphology intermediate between the condition observed in more primitive fish and that observed in tetrapods. The combination of characters in T. roseae helps to resolve the relative timing of modifications in the cranial endoskeleton. The sequence of modifications suggests changes in head mobility and intracranial kinesis that have ramifications for the origin of vertebrate terrestriality.
机译:在“鱼到四足动物”过渡期间发生的形态学变化中,颅骨内骨骼显着重组。从化石记录来看,这种过渡的细节(包括角色获取的顺序)还不明显。在这里,我们描述了提克塔利克玫瑰科的蝶形颅壳,四足动物和分支骨架,后者是与四足动物最密切相关的晚泥盆纪sa翅目鱼类。尽管在许多方面都保留了原始构型,但玫瑰蔷薇的颅内骨骼与四足类动物共享衍生的特征,例如大的基底关节和平坦的,水平定向的线虫。蔷薇科的其他特征,例如短而直的hyandandibula,显示出形态学介于介于较原始鱼类和四足动物之间。玫瑰蔷薇科中字符的组合有助于解决颅骨内骨骼修饰的相对时间。修饰序列表明头部活动性和颅内运动的改变对脊椎动物的陆生起源有影响。

著录项

  • 来源
    《Nature》 |2008年第7215期|p.925-929|共5页
  • 作者单位

    Academy of Natural Sciences of Philadelphia, 1900 Benjamin Franklin Parkway, Philadelphia, Pennsylvania 19103, USA;

  • 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

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