大脑结构解决了异常糖附属体的细分亲和力
Peiyun Cong1, Xiaoya Ma2, Xianguang Hou1
1Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China.
Nature
|July 22, 2014
概括
这项研究揭示了古老的关节动物亲属Lyrarapax unguispinus具有细分的大脑. 这一发现支持异常类动物是干群欧类动物,前部附属物进化为.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 神经科学是一个神经科学.
背景情况:
- 坎布里亚时代著名的化石 - - Anomalocaridids - - 在移动动物 (Ecdysozoa) 中具有不确定的进化关系.
- 之前的研究讨论了它们作为干群欧类动物,皇冠群欧类动物或由于不清楚的额头附属物同质性而形成单独的血统的位置.
研究的目的:
- 通过检查一种新物种Lyrarapax unguispinus的神经解剖学来研究异常类动物 (Radiodonta) 的亲属关系.
- 为了澄清异常糖头部的细分组织及其前部附属物的起源.
主要方法:
- 来自坎布里亚早期成江生物群的Lyrarapax unguispinus的描述,保存软组织.
- 在化石脑组织中分析富含碳的区域,以推断神经组织和附属连接.
主要成果:
- 莱拉拉帕克斯 (Lyrarapax unguispinus) 呈现出一个背部,细分的大脑,并配对与前附属物相连接的前原脑.
- 神经解剖学证据支持放射牙动物和节肢动物之间的联盟,与旋风神经动物不同.
- 大脑的组织与Onychophora相似,这表明眼前额头附属体是欧类动物和类动物的祖先特征.
结论:
- 放射性体位于欧类动物的干系上.
- 异常类动物的前额附属体对应于皇冠群欧类动物的部.
- 这项研究提供了对异常糖头的细分组成及其对关节动物进化的影响的直接证据.
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