在X射线微型计算机断层扫描中揭示了Simosaurus gaillardoti (Diapsida:Sauropterygia) 的脑解剖学
Elisa H London1, Dennis F A E Voeten2,3, Henning Blom4
1Department of Earth Sciences, Uppsala Universitet, Uppsala, Sweden.
PeerJ
|September 29, 2025
概括
X射线微型计算机断层扫描揭示了Simosaurus gaillardoti脑的新细节,证实了近岸水生适应,并支持其在Nothosauroidea中的位置. 这项研究突出了Nothosauroidea类的不同养策略.
科学领域:
- 古生物学的古生物学
- 脊椎动物古生物学 脊椎动物古生物学
- 海洋爬行动物的进化
背景情况:
- 类 (Sauropterygia) 是中生代海洋爬行动物的一个分类,包括Simosaurus gaillardoti,传统上属于Nothosauroidea.
- 之前对S. gaillardoti脑的研究依赖于破坏性酸制备,限制了解剖细节.
- 射线微型计算机断层扫描 (CT) 提供了一种非破坏性的方法来可视化微妙的化石结构.
研究的目的:
- 通过使用高分辨率的X射线CT来虚拟重建和分析Simosaurus gaillardoti的大脑盒.
- 为了研究S. gaillardoti的神经解剖学,神经通道和血管系统.
- 为了比较S. gaillardoti的脑形态与其他nothosaurs,以改进家族遗传的位置和理解功能形态.
主要方法:
- 保存完好的Simosaurus gaillardoti (SMNS 16363) 的头骨使用X射线微型计算机断层扫描进行了扫描.
- 脑区域几乎是从CT数据中提取出来的.
- 分析了脑内膜形态,脑内膜,脑神经,动脉和内耳结构.
主要成果:
- 虚拟重建揭示了详细的内造形,形状的存在,神经路径和内动脉分叉.
- 基状体延伸成一种培养过程,到达鼻腔开口.
- 内耳半圆形通道的布置支持了近岸水生生物的适应.
- 脑与Nothosaurus marchicus的相似之处,包括骨孔结构,支持S. gaillardoti在Nothosauroidea中的基本位置.
- 头骨平坦化的差异表明不同的食策略:长动物/食鱼动物S. gaillardoti与鱼陷捕食者nothosaurs.
结论:
- 非破坏性X射线CT为Simosaurus gaillardoti braincase提供了关键的解剖数据.
- 这些发现支持S. gaillardoti在Nothosauroidea中的遗传位置,并突出了适应近海环境的情况.
- 在Nothosauroidea中,不同的头骨形态和食策略表明了专门的鱼类动物的潜在独立进化.
关键词:
欧索欧普特里基亚 (Eosauropterygia) 是一种新生植物.中三叠纪中期的三叠纪.贝可以说是贝.古代神经病学 古代神经病学它们属于Simosauridae的类型.虚拟终结播放是一个虚拟的终结播放.更多相关视频
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