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相关概念视频

Taxonomy01:31

Taxonomy

69.2K
Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.
Hierarchy of Taxonomy
The hierarchy that Carolus Linnaeus first...
69.2K
Phylogeny01:23

Phylogeny

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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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What is Evolutionary History?02:35

What is Evolutionary History?

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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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The Fossil Record02:56

The Fossil Record

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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...
23.0K
Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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相关实验视频

Updated: Apr 28, 2026

Minimally Invasive Embryo Transfer and Embryo Vitrification at the Optimal Embryo Stage in Rabbit Model
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Minimally Invasive Embryo Transfer and Embryo Vitrification at the Optimal Embryo Stage in Rabbit Model

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子,动物和其他现存的类哺乳动物的晚白时期的亲属.

J D Archibald1, A O Averianov, E G Ekdale

  • 1Department of Biology, San Diego State University, San Diego, California 92182-4614, USA. darchibald@sunstroke.sdsu.edu

Nature
|November 2, 2001
PubMed
概括

在乌兹别克斯坦发现的化石显示,一些白纪晚期的eutherians,如Kulbeckia,属于胎盘哺乳动物群 (Placentalia). 这一发现推迟了胎盘哺乳动物的起源比以前认为的更早.

科学领域:

  • 古生物学的古生物学
  • 哺乳动物进化 哺乳动物进化
  • 人类遗传学 是一个学科.

背景情况:

  • 尤瑟里亚包括现存的胎盘哺乳动物及其已灭绝的亲属.
  • 乌兹别克斯坦的德哈拉库杜克动物群代表了已知的最古老的以为主导的群体.
  • 对于哺乳动物进化史来说,了解早期的类关系至关重要.

研究的目的:

  • 为了研究来自Dzharakuduk动物群的早期eutherian哺乳动物的遗传学位置.
  • 为了完善胎盘哺乳动物 (Placentalia) 多样化的时间表.
  • 测试现有的关于白纪晚期eutherian关系的假设.

主要方法:

  • 对详细描述的晚白纪eutherians的遗传学分析.
  • 纳入化石种类,代表动物,形动物和古老类动物.
  • 化石年龄与分子分歧估计的比较.

主要成果:

  • 库尔贝基亚 (Kulbeckia),来自85-90万年前的德哈拉库杜克动物群,被确定为Zalambdalestidae,扩大了该家族的范围.
  • 遗传学分析强烈支持Zalambdalestidae和"Zhelestidae",但不是Asioryctitheria.

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  • 晚白时期的eutherians,包括Zalambdalestidae,被放置在王冠组Placentalia.

    • 结论:

    • 一些白纪晚期的eutherians被证实属于胎盘类.
    • 一些胎盘哺乳动物超级秩序的多样化与分子估计一致.
    • 证据不支持现存的胎盘秩序的晚白纪起源.