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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...
Convergent Evolution01:54

Convergent Evolution

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.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...

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相关实验视频

Updated: Jun 5, 2026

Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis
10:55

Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis

Published on: March 17, 2014

对关节动物头部问题的古生物学解决方案.

Graham E Budd1

  • 1Department of Earth Sciences (Historical Geology and Palaeontology), Uppsala University, Norbyvägen 22, Uppsala, Sweden. graham.budd@pal.uu.se

Nature
|May 17, 2002
PubMed
概括

坎布里亚时期的化石关节动物揭示了关节动物头部进化的洞察力. 这些古老的生物拥有独特的附属物,有助于澄清主要关节动物群体之间的关系.

科学领域:

  • 动物学 动物学
  • 古生物学的古生物学
  • 进化生物学 进化生物学

背景情况:

  • 关节动物头部的组成在动物学中仍然是一个长期存在的争论.
  • 以前的理论受到化石节肢动物系统学上的共识缺乏的阻碍.

研究的目的:

  • 通过使用坎布里亚化石证据来解决关节动物头部组成这一有争议的话题.
  • 为了确定有问题的坎布里亚节足动物的遗传位置.

主要方法:

  • 从伯吉斯页岩和成江动物群中对坎布里亚节肢动物进行系统分析.
  • 与现存的关节动物群体 (脚动物,类动物,昆虫,甲类动物) 和类动物 (onychophorans) 的比较形态.
  • 皇冠群欧类动物基层图的重建.

主要成果:

  • 以前被认为是有问题的坎布里亚节足动物的一个分类被确定为接近皇冠群欧类动物.
  • 这些化石展示了经过修改或缺失的内脚和两个口前附属物.
  • 两个口前附属体被确定为第一个天线和一个减少的眼部片段附属体,可能是乳房前体的前体.

结论:

  • 这些坎布里亚化石弥合了基类动物和类动物之间的进化差距.

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Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis
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Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis

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A Protocol for Bioinspired Design: A Ground Sampler Based on Sea Urchin Jaws

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Light Sheet-based Fluorescence Microscopy of Living or Fixed and Stained Tribolium castaneum Embryos

Published on: April 28, 2017

  • 这些发现澄清了关节动物进化中的附属体的同质性.
  • 这项研究为理解关节动物头部细分提供了新的框架.