古人類学. 古人類学. 初期のホモは,エチオピアのアファルのレディ・ゲラルーから2.8万年前
Brian Villmoare1, William H Kimbel2, Chalachew Seyoum3
1Department of Anthropology, University of Nevada Las Vegas, Las Vegas, NV 89154, USA. Center for the Advanced Study of Hominin Paleobiology, George Washington University, Washington, DC 20052, USA. Department of Anthropology, University College London, London WC1H 0BW, UK. brian.villmoare@unlv.edu wkimbel.iho@asu.edu.
まとめ
エチオピアからの化石証拠は,280万年前の最も初期のホモの存在を明らかにしています. この発見は,人間の進化とホモ属の起源を理解するギャップを埋める.
科学分野:
- 古人類学は,古人類学である.
- 人間の進化 人類の進化
- パレオントロジー・パレオントロジー
背景:
- ホモ属の起源は,東アフリカで2,0~3,0百万年前の間の稀な化石記録があるため,ほとんど理解されていません.
- 既存の化石の証拠は,アウストラロピテクスからホモへの移行を十分に説明していません.
研究 の 目的:
- ホモニンの下肢の発見を報告し,ヒト属の初期進化に関する新しい洞察を提供した.
- 化石記録で知られている最も初期のホモの存在を確立するために.
主な方法:
- 歯のある部分的なホミニン下の発掘と分析.
- 地質学的文脈を用いた化石標本の年代測定.
- 既知のヒト類種との形態学的比較.
主要な成果:
- エチオピアのレディ・ゲラルー遺跡から発見されたホミニンの下の発見は,約280万〜275万年前に遡る.
- この標本には,原始のアウストラロピテクスのような特徴と,その由来でホモのような特徴が混じっている.
- この発見は,ホモの最古の証拠を約40万年前に後退させる.
結論:
- レディ・ゲラルーの下肢は,2800万年前にホモが存在していたことを確認しています.
- ホモとオストラロピテクスを分離する歯の特徴は,ホモの系統の初期に現れた.
- この発見は,ヒト属の時期と地理的起源に関する仮説に影響を与えます.
さらに関連する動画
関連する概念動画
The Fossil Record
28.6K
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...
28.6K
What is Evolutionary History?
45.2K
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.
45.2K
Optimal Foraging
14.3K
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
14.3K
Synteny and Evolution
4.1K
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
4.1K
Global Climate Change
29.9K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
29.9K
Eukaryotic Evolution
43.9K
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...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
43.9K


