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一个原始的sarcopterygian鱼与一个眼
M Zhu1, X Yu, P E Ahlberg
1Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing.
Nature
|March 10, 2001
概括
新的化石鱼,阿丘亚尼亚,揭示了早期的骨鱼的进化,并挑战了关于actinopterygians和sarcopterygians的分歧的想法. 这一发现突显了早期骨类动物的并行进化.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 脊椎动物动物学 脊椎动物动物学
背景情况:
- 早期德纪的骨科动物 (骨鱼) 化石如Psarolepis和澳大利亚脑袋挑战了关于骨科动物起源和分歧的现有理论.
- 这些化石显示出衍生的sarcopterygian和actinopterygian特征以及原始特征的混合,这表明早期骨类进化的显著并行性.
- 之前的解释受到遗传学分辨率差的限制.
研究的目的:
- 为了描述一个新的基底石鱼,阿乔亚尼亚属. 在新的一年里.
- 为了澄清Psarolepis和更多衍生的sarcopterygians之间的形态差距.
- 为了研究早期骨类动物中眼附着的存在.
主要方法:
- 化石描述和对比形态的阿乔亚尼亚属. 和sp. 在新的一年里.
- 植物遗传学分析包括新的化石数据.
- 对化石标本进行特定解剖特征的检查,例如眼附着物.
主要成果:
- 阿丘亚尼亚属. 和sp. 描述了nov. ,代表了一个基底sarcopterygian,弥合了Psarolepis和更高的sarcopterygians之间的形态差距.
- 在阿丘亚尼亚和Psarolepis两个地区都发现了眼的附着物.
- 这一发现表明,以前被认为是非骨类动物独有的眼附着物,在基底石类动物中也存在.
结论:
- 阿丘亚尼亚的发现提升了我们对类动物进化和骨类鱼类早期多样化的理解.
- 在基底石类动物和类似actinopterygian的化石中存在眼附着的存在表明,这种特征比以前理解的要早.
- 早期的骨类鱼类进化可能涉及骨类鱼类主要血统之间的实质性平行性.
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