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相关概念视频

The Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...

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相关实验视频

Updated: Jul 12, 2026

Obtaining Eggs from Xenopus laevis Females
04:47

Obtaining Eggs from Xenopus laevis Females

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来自犹他州的上罗纪恐龙蛋.

K F Hirsch, K L Stadtman, W E Miller

    Science (New York, N.Y.)
    |March 31, 1989
    PubMed
    概括

    这项研究描述了一个独特的上罗纪恐龙蛋,填补了1亿年的化石空白. 它的状况表明,在埋葬时,卵子被保留在卵管内.

    科学领域:

    • 古生物学的古生物学
    • 卵巢学 卵巢学 卵巢学是一门学科.
    • 脊椎动物古生物学 脊椎动物古生物学

    背景情况:

    • 化石记录显示,在罗纪下期和白纪上期之间的恐龙蛋中存在着相当大的1亿年的差距.
    • 恐龙巢和蛋为繁殖策略和古生态学提供了关键的见解.

    研究的目的:

    • 为了描述一个新发现的上罗纪恐龙蛋.
    • 为了研究蛋的语音和病理状况.
    • 为了推断卵子的沉积环境和生殖史.

    主要方法:

    • 古生物学挖掘和分析.
    • 卵微观结构与现代和化石爬行动物的比较分析.
    • 对卵子沉积背景的音声学评估.

    主要成果:

    • 发现了第一个已知的上罗纪恐龙蛋,弥合了化石记录中的一个重大差距.
    • 蛋的病态多层,类似于现代和化石爬行动物.
    • 埋葬时柔软的蛋状况,表明化石不完全.

    结论:

    • 卵子的状况强烈地表明在埋葬时的卵巢保留.

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  • 这一发现为恐龙的繁殖行为和化石化所带来的挑战提供了新的见解.
  • 该标本代表了理解恐龙卵巢保留的关键证据.