对Solenogastres (Mollusca, Aplacophora) 的基因组重建为关于身体尺寸演变的假设提供了信息
Meghan K Yap-Chiongco1, Franziska S Bergmeier1, Nickellaus G Roberts1
1Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL, USA.
Molecular phylogenetics and evolution
|February 10, 2024
概括
海洋生物 (软体动物) 很可能是从一个小体的祖先进化而来的,这挑战了以前的大体祖先理论. 在Solenogastres中,人体尺寸的演变是动态的,稳定的体型规划有助于在不同尺寸范围内进行过渡.
科学领域:
- 进化生物学 进化生物学
- 动物学 动物学
- 人类遗传学 是一个学科.
背景情况:
- 身体尺寸是影响动物生物学和进化的关键特征.
- 单体生物 (软体动物) 对于了解早期的软体动物进化至关重要,过去的研究表明有小体的祖先.
- 最近的基因组学研究提出了类动物的大体祖先,对Solenogastres的祖先身体大小产生了不确定性.
研究的目的:
- 为了研究Solenogastres的祖先身体大小,使用来自各种 meiofaunal 物种的族谱数据.
- 解决有关早期分支的Solenogastres家族的遗传学位置的相互矛盾的假设.
- 在Solenogastres中重建身体尺寸的进化历史.
主要方法:
- 从八种不同的动物中分析了多达949个基因.
- 最大概率和贝叶斯推理分析以推断家族遗传关系.
- 祖先的性格状态重建,以模拟身体大小的演变.
主要成果:
- 最大概率分析支持Meiomeniidae (小体) 作为其他Solenogastres的姐妹,与小体祖先一致.
- 贝叶斯推理分析表明Amphimeniidae (大体动物) 是其他Solenogastres的姐妹.
- 遗传学信号分析有利于Meiomeniidae-first拓,表明一个小体的祖先.
结论:
- 证据支持Solenogastres的小体祖先,修订了以前的概念.
- 在Solenogastres中,身体尺寸的演变非常动态,在 meio, macro 和 megafaunal 尺寸之间发生过渡.
- 在Solenogastres中,一个保存的体型规划促进了适应跨大小范围的多样化生态.
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