関連する実験動画
Updated: Nov 12, 2025

10:09
In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development
Published on: June 16, 2022
2.6K
中世における鳥の声器の化石証拠
Julia A Clarke1, Sankar Chatterjee2, Zhiheng Li1,3
1Department of Geological Sciences, University of Texas at Austin, Austin, Texas 78756, USA.
Nature
|October 13, 2016
まとめ
化石化した鳥の声器は 非常に稀です 研究者が発見した 3Dシリンキス化石は クレータ紀後期の南極で 初期の鳥の発声と進化の洞察を示しています
科学分野:
- 古生物学
- 進化生物学
- 鳥類の解剖学
背景:
- 鳥の声帯は鳥の声帯で 鳥の声帯は鳥の声帯で 鳥の声帯は
- 化石化したシリンキは極めて稀で,知られている標本の大半は地質学的に若い.
- シリンキの3次元幾何学とその軟組織構造に関するデータは限られている.
研究 の 目的:
- メソゾーイク時代の 最初の3次元化石のシリンクスについて説明します
- 鳥の声器の祖先状態を再構築し,絶滅した声の性質を理解する.
- 鳥類のシリンキスの化石化の可能性と 進化のタイミングを調査する
主な方法:
- 南極で発見した白期のシリンクス化石のCTスキャンです
- 12羽の現存する異種鳥のシリンクス構造のCT分析.
- 以前に記述されていないエオセンのシリンクス標本の画像.
主要な成果:
- 紀元後期から3次元で保存された,最も古い化石のシリンクスの記述.
- 声帯を固定するためのネオグナスの特徴であるベガビスのよく鉱化したペスルスの識別.
- ベガビスの左-右の気管不対称性の観察は,二重の声帯音源を示唆しています.
結論:
- この発見は 鳥の声器の化石化の可能性を示しています
- 複雑なシリンキスは 鳥の進化の後に 飛翔や呼吸器の革新によって 進化したと考えられます
- メソゾイク期のシリンクス化石の希少さは 鳥の複雑な発声の 遅い起源を示唆している.
関連する概念動画
The Fossil Record
26.5K
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...
26.5K
The Evidence for Evolution
45.6K
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.
45.6K
Convergent Evolution
30.3K
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.
30.3K
What is Evolutionary History?
41.3K
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.
41.3K
The Auditory Ossicles
2.5K
The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
2.5K
Larynx
3.0K
The human larynx, often referred to as the voice box, is an intricate organ located in the neck. It serves as a pathway for air to enter the lungs during respiration and is an essential component of voice production.
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
Anatomy of the Larynx
The larynx consists of various components, including cartilage, muscles, and vocal cords. Its structure includes three large unpaired cartilages—the thyroid, cricoid, and epiglottis—and three smaller paired cartilages—the arytenoids,...
3.0K

