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一种奇怪的,的卡卡罗罗多多多类动物 (Theropoda) 来自西班牙的低白纪
Francisco Ortega1, Fernando Escaso, José L Sanz
1Grupo de Biología, Departamento de Física Matemática y de Fluidos, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, Paseo Senda del Rey 9, 28040 Madrid, Spain. fortega@ccia.uned.es
Nature
|September 11, 2010
概括
一种新的恐龙,Concavenator corcovatus,揭示了原始的卡卡罗罗多多多类的特征和潜在的羽毛结构. 这一发现扩大了我们对热足恐龙早期羽毛起源的理解.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 脊椎动物动物学 脊椎动物动物学
背景情况:
- 卡卡罗多多龙,最大的捕食恐龙,以前被认为仅限于白纪晚期的冈多瓦纳陆地群体.
- 最近的劳拉西亚证据需要重新评估卡卡罗多多索亚的多样化和进化历史.
- 卡卡罗龙龙的早期进化历史比以前理解的要复杂得多.
研究的目的:
- 为了描述一种新的热足类恐龙分类,Concavenator corcovatus,来自西班牙的下白纪.
- 在Carcharodontosauria中分析Concavenator corcovatus的遗传位置.
- 调查Concavenator corcovatus的不同寻常的解剖特征,特别是其与羽毛起源的潜在联系.
主要方法:
- 一个几乎完整的骨的描述 Concavenator corcovatus.
- 克拉迪斯蒂克分析以确定家族遗传关系.
- 与现代鸟类的骨结构的比较解剖学.
主要成果:
- 康卡维纳托·科科瓦图斯 (Concavenator corcovatus) 被确定为一个原始的卡卡罗多多多类动物.
- 这种新分类表现出一种独特的形结构,由延长的脊椎过程形成.
- 在Concavenator corcovatus的肘部上出现的小块被认为是鸟类中羽毛旋的同类,表明了体毛囊结构.
结论:
- Concavenator corcovatus提供了关于早期卡卡罗多多类动物进化和多样化的重要见解.
- 在Concavenator的骨上存在潜在的与羽毛相关的结构,扩展了非尺度的皮肤附属物的基因组支架,与热足类恐龙的羽毛相同.
- 这一发现扩大了理解类恐龙羽毛的起源和演变的范围.
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