在Homo nalediledi中,类似人类的面生长
Patrick Mahoney1, Gina McFarlane1, Alberto J Taurozzi2
1Skeletal Biology Research Centre, School of Anthropology and Conservation, University of Kent, Canterbury, UK.
American journal of biological anthropology
|January 5, 2024
概括
对Homo naledi牙的研究揭示了与现代人类相似的质生长模式,与大多数化石原始人相比,狗的形成时间更长. 这些发现提供了对人类牙发育进化的见解.
科学领域:
- 古人类学古人类学.
- 牙科组织学 牙科组织学
- 人类进化人类的进化.
背景情况:
- 牙的发育模式是最近在人类进化过程中演变的.
- 纳勒迪人,与早期的智人人类暂时重叠,为研究质生长演变提供了一个独特的案例.
- 关于原始人牙增长的先前研究对于许多化石物种是有限的.
研究的目的:
- 对Homo naledi永久牙 (下牙和大第一个) 进行第一个组织学分析.
- 为了重建内的生长速度和持续时间在Homo naledi.
- 为了比较Homo naledi质的生长模式与其他化石原始人和最近的人类.
主要方法:
- 准备从三个Homo naledi个体的永久下犬和大第一的薄片.
- 测量每日和更长时间的增量标记,以确定牙的分泌率和延伸率.
- 重建Retzius周期性和冠状形成时间.
主要成果:
- 在Homo naledi中,每日质分泌率与最近的原始人相美.
- 狗的冠状形成时间与最近的欧洲人相似,但比大多数其他人类更长,这归因于高大的冠状和缓慢的宫延伸.
- 在Homo naledi中,Retzius的周期性 (犬类11天,类9天) 与最近的人类一致,不同于对小大脑人类的预期,以及其他化石物种的模式.
结论:
- 纳勒迪人的牙增长与最近的人类有相似之处,特别是在Retzius周期性.
- 在Homo naledi中延长狗的形成时间是许多化石人类的显著偏差.
- 高的Retzius周期值挑战了对小大脑人类的预期,这表明牙发育中的复杂进化途径.
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