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関連する概念動画

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,...
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...
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...
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...
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...
The Colonization of Land02:22

The Colonization of Land

Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...

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関連する実験動画

Updated: Jul 11, 2026

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
08:02

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Published on: May 7, 2016

シルリアンの軟体生物群である.

D G Mikulic, D E Briggs, J Kluessendorf

    Science (New York, N.Y.)
    |May 10, 1985
    PubMed
    まとめ

    ウィスコンシン州で新たに発見されたシルウリアン時代の化石遺跡は,最も古い保存状態のキフォスランと,潜在的旧生紀の血まみれを含む,軟体のある節足類と虫の例外的な集合体を明らかにしています.

    科学分野:

    • パレオントロジー・パレオントロジー
    • 初期のパレオゾーイク 節足類の進化
    • 化石生物群の分析

    背景:

    • 特別に保存された化石の遺跡は,下古石器時代の岩石では稀であり,初期の海洋生物の理解を制限しています.
    • シルル紀 (ランドヴェル紀) は,海洋無脊椎動物の多様化にとって重要な時期を表しています.

    研究 の 目的:

    • ウィスコンシン州から新たに発見された,重要な軟体成分を持つシルウリアン生物群を記述する.
    • このユニークな化石の集合体の分類的組成と古老環境への影響を分析する.

    主な方法:

    • ウィスコンシン州のシルウリア (ランドーヴェリア) 遺跡からの地質学的地図と化石収集.
    • 節足類や虫を含む化石標本の詳細な形態学的分析と分類的識別.
    • 既知の下 палеозойのファウナと, палеоenvironmentalの解釈との比較分析.

    主要な成果:

    • バイオタは,関節足類と虫によって支配されており,重要な軟体成分が特徴です.
    • 重要な発見には,最も古くから保存されているキフォスラン,海洋のユネラミアン,不確実な親近性の3つの新しい節足類,そしておそらく最初のパレオゾーイク・リーチが含まれています.
    • この遺跡は,コノドント動物を産出した2番目の地域にすぎず,典型的な貝殻動物群の欠如は,異常な堆積環境を示唆しています.

    さらに関連する動画

    A Protocol for Bioinspired Design: A Ground Sampler Based on Sea Urchin Jaws
    09:10

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

    Published on: April 24, 2016

    Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography
    07:30

    Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography

    Published on: November 14, 2025

    関連する実験動画

    Last Updated: Jul 11, 2026

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
    08:02

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

    Published on: May 7, 2016

    A Protocol for Bioinspired Design: A Ground Sampler Based on Sea Urchin Jaws
    09:10

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

    Published on: April 24, 2016

    Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography
    07:30

    Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography

    Published on: November 14, 2025

    結論:

    • この発見は,下パラオゾーイク期の例外的に保存されたファウナの既知の記録を大幅に拡張します.
    • バイオタのユニークな構成は,シルル紀期の節足類の多様性と古生態学に関する新しい洞察を提供します.
    • 珍しい環境条件は,特定の動物集団と貝殻生物の欠如によって強調されています.