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相关概念视频

What is Evolutionary History?02:35

What is Evolutionary History?

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.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...
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...
Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...

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相关实验视频

Updated: Jul 12, 2026

Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
15:39

Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm

Published on: February 28, 2017

来自低白时期鱼类的化石寄生虫copepods.

R Cressey, C Patterson

    Science (New York, N.Y.)
    |June 22, 1973
    PubMed
    概括
    此摘要是机器生成的。

    在低白纪鱼类中发现的化石寄生虫copepods提供了最古老的copepod证据,支持鱼类寄生虫进化的理论.

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    Collecting Marine Gnathiid Isopod Fish Parasites with Light Traps
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    Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm
    15:39

    Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm

    Published on: February 28, 2017

    Individual Culturing of Tigriopus Copepods and Quantitative Analysis of Their Mate-guarding Behavior
    06:24

    Individual Culturing of Tigriopus Copepods and Quantitative Analysis of Their Mate-guarding Behavior

    Published on: September 26, 2018

    Collecting Marine Gnathiid Isopod Fish Parasites with Light Traps
    06:43

    Collecting Marine Gnathiid Isopod Fish Parasites with Light Traps

    Published on: September 25, 2023

    科学领域:

    • 古生物学的古生物学
    • 海洋生物学 海洋生物学
    • 进化生物学 进化生物学

    背景情况:

    • 寄生虫copepods,特别是caligids,是重要的海洋鱼类外寄生虫.
    • 包括寄生虫形式在内的siphonostomecopepods的进化起源仍然不完全理解.
    • 对于copepods,特别是寄生虫的先前化石证据是稀缺的.

    研究的目的:

    • 描述从低白纪新发现的化石copepods.
    • 为了研究无脊椎动物关联的siphonostomes和鱼类寄生虫caligidcopepods之间的进化联系.
    • 为了建立已知最古老的copepod化石记录.

    主要方法:

    • 化石标本是从鱼Cladocyclus gardneri的腔中提取出来的.
    • 对化石copepods进行了形态分析.
    • 确定了Dichelesthioidea超级家族内的化石copepods的遗传位置.

    主要成果:

    • 保存良好的化石copepods,归因于超级家族Dichelesthioidea,被恢复.
    • 这些化石代表了首次发现的化石寄生虫copepods.
    • 这些发现为连接无脊椎动物相关的siphonostomes与caligidcopepods的假设提供了强有力的支持.
    • 发现的化石构成了已知最古老的copepods一个显著的边缘.

    结论:

    • 这一发现代表了理解足动物进化和古寄生虫学的重大进步.
    • 这些化石证实了copepods和鱼之间的古代寄生关系.
    • 这些发现显著推翻了已知的copepods化石记录.