来自澳大利亚的一个特殊的纪鱼,揭示了四足动物的起源
John A Long1, Gavin C Young, Tim Holland
1Museum Victoria, P O Box 666, Melbourne, Australia 3001. jlong@museum.vic.gov.au
Nature
|October 20, 2006
概括
一种德纪鱼化石 - - 戈戈纳索斯 (Gogonasus) - - 显示出令人惊的四足动物类特征. 这一发现重新塑造了我们对脊椎动物进化和鱼到四足动物的转变的理解.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 脊椎动物古生物学 脊椎动物古生物学
背景情况:
- 从鱼类向四足动物的转变是一个关键的进化事件,然而,化石记录往往呈现不完整的数据用于家族遗传学分析.
- 了解四足动物进化的早期阶段需要检查过渡期化石,这些化石弥合了水生和陆生脊椎动物之间的差距.
研究的目的:
- 为特别完整的Gogonasus化石提供新的观察结果.
- 分析Gogonasus在四足形态动物中的遗传位置.
- 为了研究Gogonasus中原始和衍生特征的马赛克.
主要方法:
- 对戈戈纳索斯化石进行了详细的形态检查.
- 与其他德纪鱼类和早期四足动物进行比较分析.
- 植物遗传学分析包括新的戈戈纳索斯数据.
主要成果:
- 戈戈纳索斯表现出一个独特的综合的通用和专业的头骨特征.
- 专业的特征包括一个深入的阴道螺旋和近水平的下.
- 胸骨与Tiktaalik有相似之处,这是一个衍生的四足形态动物.
- 遗传学分析将Gogonasus定位为Elpistostegalia的姐妹分类.
结论:
- 戈戈纳索斯提供了对四足形态辐射的关键见解.
- 早期四足动物的四肢和中耳的特征可以追溯到进化历史上.
- 这项研究完善了对鱼类到四足动物过渡的理解.
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