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“你他妈的别舔”-梳理天下新闻

177万年你他妈的别舔前化石研究:早期古人类或兼具类猿早熟和类人发育延迟

来源: 上游新闻
2024-11-17 22:44:53

最佳回答

“你他妈的别舔”177万年你他妈的别舔前化石研究:早期古人类或兼具类猿早熟和类人发育延迟

  中新你他妈的别舔网北京11月17日电 (记者你他妈的别舔 孙自法)国际著名学术期刊《自然》最新发表一篇演化论文称,研究人员通过分析来自格鲁吉亚德马尼西的距今177万年前的古人类牙齿化石,发现早期古人类或结合了类猿的早熟和类人的发育延迟的特征。这一研究结果为人类古代近亲的发育过程提供了新认知。

格鲁吉亚德马尼西早期智人的一个年轻个体头骨和牙齿的X射线视图。施普林格自然/供图

  该论文介绍,与最近的现生近亲大猿相比,人类有多个独有特征,包括童年期延长和成熟期延迟。牙齿对于理解演化改变的历史具有重要意义,因为牙齿能保留渐进的生长模式,用于推断发育速度和时间。已知人类牙齿比大猿牙齿成熟得慢,尤其是恒磨牙,并且这与不同灵长类的大脑发育速度以及身体成熟速度相关。此次研究的德马尼西化石可追溯至177万年前,代表了非洲以外的部分人属最早成员,为研究人员了解早期人类发育过程提供了机会。

  在本项研究中,论文第一作者兼共同通讯作者、瑞士苏黎世大学Christoph P. E. Zollikofer和同事及合作者一起,利用先进成像技术分析了一名德马尼西早期人属个体的牙齿微观结构,这名个体在约11岁牙齿成熟前刚刚去世。他们研究发现,该个体牙齿发育速度很快,与现生大猿类似。然而,这名个体具有与人类类似的、后牙发育晚于前牙以及牙齿发育高峰较晚的特征。

  论文作者认为,这种兼具了类似大猿与类似人类的牙齿发育特征表明,早期人属在生活史整体减慢前就演化出了更长的发育阶段,这可能与生物文化繁殖(涉及生物与文化两方面)有关,而不是与大脑发育有关。

  《自然》同期发表同行专家的“新闻与观点”文章指出,该项研究结果表明,人类祖先的发育模式可能比之前认为的更加多变。(完)

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