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考古学: 鳥類でない恐竜の"現代的な"羽毛
Mark Norell1, Qiang Ji, Keqin Gao
1American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA. norell@amnh.org
Nature
|March 8, 2002
まとめ
中央軸と棒を持つ羽毛は,非鳥類の恐竜にも発見されました. この発見は,複雑な羽根が鳥や飛行の前に進化したことを示しています.
科学分野:
- パレオントロジー・パレオントロジー
- 進化生物学の進化生物学について
- 恐竜の古生物学について
背景:
- 恐竜の全身覆いの発見は頻発しています.
- 現代のタイプの羽の確固たる証拠は,以前は,いくつかの特定の種に限定されていました.
研究 の 目的:
- 非鳥類のセロポッド恐竜の高度な羽の出現を記述する.
- 恐竜の羽毛の進化のタイムラインを決定する.
主な方法:
- 化石の発掘と分析.
- 体構造の顕微鏡検査.
主要な成果:
- ラキスとバーブを特徴とするピナテの羽は,中国から来た小さな非鳥類ドロメオサウルスの身上で確認された.
- これらの羽は,構造的には現代の鳥の羽と似ています.
結論:
- 現代の風貌の羽毛は,鳥の起源より前に恐竜で進化した.
- 羽毛の進化は,鳥の飛行の発展よりずっと前のものです.
関連する概念動画
Phylogeny
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.
Non-vascular Seedless Plants
The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
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.
The Evidence for Evolution
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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 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.

