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関連する概念動画

Eukaryotic Evolution01:24

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Cell Diversity01:13

Cell Diversity

The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
Multicellular organisms...
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...
Overview of Protists01:27

Overview of Protists

Protists are diverse eukaryotic microorganisms that lack the specialized tissues of plants and animals and the chitinous cell walls of fungi. Their early divergence within Eukarya resulted in structural, functional, and ecological diversity. They are classified into supergroups such as Archaeplastida, Excavata, Amoebozoa, Rhizaria, Alveolata, and Stramenopiles, determined through genetic analysis and structural similarities.Structural and Functional AdaptationsProtists have various adaptations...
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,...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

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関連する実験動画

Updated: May 22, 2026

The Polyvinyl Alcohol Sponge Model Implantation
06:23

The Polyvinyl Alcohol Sponge Model Implantation

Published on: April 18, 2012

プレキャンブリアスポンジは,細胞構造を持つスポンジです.

Li1, Chen, Hua

  • 1C.-W. Li and T.-E. Hua, Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan, China. J.-Y. Chen, Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing, China.

Science (New York, N.Y.)
|February 18, 1998
PubMed
まとめ

5億8000万年前のドゥシャントゥー形成の化石スポンジは,初期の動物生活を明らかにしています. これらの初期のポリフェラ (スポンジ) は,カンブリア爆発より数百万年前に存在していた.

科学分野:

  • パレオントロジー・パレオントロジー
  • 生命の初期 進化 進化とは
  • プレカンブリア生物学の学科

背景:

  • 中国南部のドゥシャントウの酸塩鉱床は,非常に初期のメタゾーン生物を保存しています.
  • 動物の系統の起源を理解するには,プレカンブリア時代の生態系からの化石を調査する必要があります.

研究 の 目的:

  • 初期のヴェンディアン・ドゥシャントゥー形成のスポンジ遺跡を調査する.
  • これらの古代のスポンジの形態学と分類学的 afinitiesを特徴付けるために.
  • 動物の進化のタイムラインへの影響を評価する.

主な方法:

  • 状のスピキュールと保存された軟組織の化石分析.
  • 現存するおよび化石のスポンジ幼虫との形態学的比較.
  • ドウシャントウのリン酸堆積地の地質年代測定.

主要な成果:

  • 識別されたスポンジ (Porifera, Demospongiae) の残骸は,約5億8000万年前に遡る,モナクソン状のスプキュールで,約5億8000万年前に遡る.
  • 保存された軟組織には,表皮,毛穴細胞,アミーボ細胞,硬化細胞,およびスポンゴコエルが含まれます.
  • パレンキメラ型のスポンジ幼虫とアンフィブラスチュラの幼虫が発見され,スポンジの生命の多様性と潜在的な石灰色のスポンジの歴史を示しています.

さらに関連する動画

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules
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A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules

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Surgical Removal of a Complex Sensory Organ in Highly Regenerative Ctenophores
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Surgical Removal of a Complex Sensory Organ in Highly Regenerative Ctenophores

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関連する実験動画

Last Updated: May 22, 2026

The Polyvinyl Alcohol Sponge Model Implantation
06:23

The Polyvinyl Alcohol Sponge Model Implantation

Published on: April 18, 2012

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules
11:25

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules

Published on: October 11, 2017

Surgical Removal of a Complex Sensory Organ in Highly Regenerative Ctenophores
05:04

Surgical Removal of a Complex Sensory Organ in Highly Regenerative Ctenophores

Published on: August 8, 2025

結論:

  • ドウシャントウのスポンジファウナは,カンブリア爆発より4千万~5千万年前に遡る,最も初期の複雑な動物のいくつかを表しています.
  • 発見は,潜在的に石灰質のスポンジを含むスポンジが,後期プレカンブリア期に重要な進化の歴史を持っていたことを示唆しています.
  • この発見は,メタゾウ類の初期の多様化に関する重要な証拠を提供します.