食姿势作为已灭绝的皮动物可变原组织的指标
Johnny A Waters1, Jan Bohatý2, D Bradford Macurda3
1Department of Geological and Environmental Sciences, Appalachian State University, Boone, NC, 28608, USA. watersja@appstate.edu.
Communications biology
|November 15, 2024
概括
研究人员在已灭绝的黑色素体中发现了可变原组织 (MCT) 的证据,这是一个独特的结合组织. 这一发现有助于理解皮的进化和关键特征的地质历史.
科学领域:
- 古生物学的古生物学
- 动物学 动物学
- 进化生物学 进化生物学
背景情况:
- 皮动物具有独特的特征,如五层对称性和可变原组织 (MCT).
- 对皮动物的遗传学分析是复杂的,因为很难追踪这些特征的地质历史.
- 在已灭绝的皮动物类中,MCT的存在和功能在很大程度上是未知的.
研究的目的:
- 在已灭绝的皮类Blastoidea中调查可变原组织 (MCT) 的存在.
- 为了分析化石的黑体结构,以证实MCT的独特性质.
- 增强对皮的进化和灭绝物种的功能形态学的理解.
主要方法:
- 来自德国的罕见德纪布拉斯托类物种样本的分析.
- 用显微镜检查保存的手臂骨的结构完整性和配置.
- 在单个标本内对手臂球进行比较分析,以推断组织状态转变.
主要成果:
- 在已灭绝的布拉斯托类动物的手臂细胞中发现了可变原组织 (MCT) 的证据.
- 化石手臂骨在刚性和合规状态下保存,这表明其具有动态组织特性.
- 标本显示了不同的手臂状结构,这可能表明单个手臂体中对MCT的神经控制.
- 在手臂骨中观察到的从刚性到合规状态的过渡表明在动态环境条件下迅速埋葬和保存.
结论:
- 已灭绝的Blastoidea中存在可变原组织 (MCT),扩大了其已知的皮动物中存在的范围.
- 布拉斯托类动物中MCT的动态性质表明对养结构的复杂控制.
- 这些发现为早期皮动物的进化历史和功能形态提供了关键的见解.
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