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在坎布里亚时代的大附属关节动物中,切利谢拉特神经基层模式
Gengo Tanaka1, Xianguang Hou, Xiaoya Ma
1Japan Agency for Marine-Earth Science and Technology, Yokosuka 2370061, Japan.
Nature
|October 18, 2013
概括
早期坎布里亚时代的关节动物神经解剖学揭示了它们的大脑结构类似于现代类动物,支持它们的进化位置. 这项研究详细介绍了Alalcomenaeus的神经系统,为早期节肢动物进化提供了洞察力.
科学领域:
- 古生物学的古生物学
- 神经科学是一个神经科学.
- 进化生物学 进化生物学
背景情况:
- 在早期坎布里亚时代的节肢动物中,神经组织的保存允许详细研究他们的神经系统.
- 了解关节动物神经解剖学是解决有关化石种群的细分身份的争议的关键.
研究的目的:
- 为了记录Alalcomenaeus sp.的神经解剖学,这是来自成江生物群的"大附属物"节肢动物.
- 为了提供迄今为止最完整的坎布里亚动物神经解剖学概况.
- 为了比较Alalcomenaeus的神经解剖学与现存的关节动物来推断进化关系.
主要方法:
- 微型计算机断层扫描 (CT) 用于可视化Alalcomenaeus的神经解剖学.
- 详细分析大脑,和头部和干部的视觉神经.
- 与现存关节动物群体的神经系统进行比较分析.
主要成果:
- 阿拉尔科梅内斯的神经系统配置与切利塞拉塔最相似,有一个视神经,一个原脑,四个头部,八个干部.
- 巨大的附属体由deutocerebral神经元体内化,这表明同样性与chelicerae.
- 切利塞拉塔和部类的大脑配置都存在于坎布里亚早期.
结论:
- 阿拉尔科梅内乌斯的神经解剖学支持其在化物总组中的位置.
- 这项研究提供了强有力的证据,证明"大附属体"和切利塞拉之间的同质性.
- 坎布里亚早期的节肢动物已经拥有了现代节肢动物中看到的两个主要的大脑结构.
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