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A primitive fish close to the common ancestor of tetrapods and lungfish

机译：接近四足动物和肺鱼共同祖先的原始鱼

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摘要

The relationship of the three living groups of sarcopterygians or lobe-finned fish (tetrapods, lungfish and coelacanths) has been a matter of debate. Although opinions still differ, most recent phylogenies suggest that tetrapods are more closely related to lungfish than to coelacanths. However, no previously known fossil taxon exhibits a concrete character combination approximating the condition expected in the last common ancestor of tetrapods and lungfish― and it is still poorly understood how early sarcopterygians diverged into the tetrapod lineage (Tetra-podomorpha) and the lungfish lineage (Dipnomorpha). Here we describe a fossil sarcopterygian fish, Styloichthys changae gen. Et sp. Nov., that possesses an eyestalk and which exhibits the character combination expected in a stem group close to the last common ancestor of tetrapods and lungfish. Styloichthys from the Lower Devonian of China bridges the morphological gap between stem-group sarcopterygians (Psarolepis and Achoania) and basal tetrapodomorphs/basal dipnomorphs. It provides information that will help in the study of the relationship of early sarcopterygians, and which will also help to resolve the tetrapod-lungfish divergence into a documented sequence of character acquisition.
机译：翼翅目鱼类或鳍翅鱼（四足动物，肺鱼和腔棘鱼）这三个生活群之间的关系一直存在争议。尽管意见仍然不同，但最新的系统发育学表明四足动物与肺鱼的关系比与腔棘鱼的关系更紧密。但是，以前没有已知的化石分类单元显示出与四足动物和肺鱼的最后一个共同祖先所期望的条件相近的具体特征组合，并且仍然知之甚少，早期的食翅目鸟类如何分化为四足动物谱系（Tetra-podomorpha）和肺鱼谱系（ Dipnomorpha）。在这里，我们描述了一种化石食翅目鱼类，Styloichthys changae gen。等等十一月，它具有眼神，并且在接近四足动物和肺鱼的最后一个祖先的茎组中展现出预期的字符组合。来自中国下泥盆统的虎耳石（Styloichthys）弥补了茎类翅翅目昆虫（Psarolepis和Achoania）与基底四足纲/基底斜足纲之间的形态学鸿沟。它提供的信息将有助于研究早期的翼龙目动物之间的关系，也将有助于解决四足动物与肺鱼之间的分歧，成为有据可查的字符采集序列。

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  • 来源
    《Nature》 |2002年第6899期|p.767-770|共4页
  • 作者

    Min Zhu; Xiaobo Yu;

  • 作者单位

    Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing 100044, China;

  • 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;
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