软组织化石化揭示了光鱼的大脑的逐步演变
Rodrigo T Figueroa1, Luiz Carlos Weinschütz2, Sam Giles3
1Department of Earth and Environmental Sciences, University of Michigan, North University Building, 1100 North University Avenue, Ann Arbor, MI 48109, USA; Museum of Paleontology, University of Michigan, Biological Sciences Building, 1105 North University Avenue, Ann Arbor, MI 48109, USA.
Current biology : CB
|June 12, 2024
概括
新的化石发现揭示了关于脊椎动物大脑演变的关键见解. 这些古老的鱼脑表现出原始的特征,修订了我们对actinopterygian神经解剖学的理解.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 神经解剖学是一个神经解剖学.
背景情况:
- 由于化石证据有限,脊椎动物大脑的进化不明,主要依赖现存物种.
- 化石中软组织的保存为神经解剖学的进化提供了罕见但至关重要的见解.
- 从*Coccocephalus*之前的发现挑战了早期actinopterygian大脑结构的现有模型.
研究的目的:
- 通过使用保存得非常好的化石,研究动类类大脑的进化历史.
- 为了澄清早期射线鱼中主要神经解剖学创新的时间和序列.
- 建立基于新的古生物学数据的脊椎动物大脑进化的修订模型.
主要方法:
- 来自巴西石灰岩 - 波斯河边界的两种不同的actinopterygian形态型的特别保存的软组织的分析.
- 详细检查化石的大脑,头骨神经,眼睛和心血管组织.
- 对骨和软组织特征的比较分析与现存和以前描述的化石actinopterygians.
主要成果:
- 化石揭示了广泛的软组织保存,证实和扩展从*Coccocephalus*的推断.
- 一个巴西形态型,与现存的actinopterygians更为密切相关,表现出一个的telencephalon,这是现代物种的关键特征.
- 所有研究的古老时代actinopterygian大脑都有共同的原始特征:无菌的小脑,下丘脑下叶,和一个小的前脑,大脑小于腔.
结论:
- 研究的Permo-Carboniferous actinopterygians代表了一个原始的等级,共享保存的神经解剖特征.
- 在一个更接近冠冕的化石中发现了长头长头的存在,为它的进化时间提供了关键的证据.
- 这些发现需要修订模型,以理解Actinopterygii的大脑进化,主要的脊椎动物血统.
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