关于Ardipithecus ramidus牙的古生物学影响
Gen Suwa1, Reiko T Kono, Scott W Simpson
1University Museum, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan. suwa@um.u-tokyo.ac.jp
Science (New York, N.Y.)
|October 8, 2009
概括
阿迪皮塞克斯 (Ardipithecus ramidus) 的牙比奥斯特拉洛皮塞克斯 (Australopithecus) 小,这表明人类的进化过程中,它们的饮食是万食的,狗类的早期减少. 这一发现为早期人类的适应性和性二态性提供了洞察力.
科学领域:
- 古人类学古人类学.
- 人类进化人类进化
- 牙科形态学 牙科形态学
背景情况:
- 中间的水阿迪皮塞克斯拉米杜斯 (Ar. 拉米杜斯 (ramidus) 的化石样本包括超过145颗牙.
- 了解早期原始人牙的特征对于重建进化历史至关重要.
研究的目的:
- 分析牙形态和磨损模式的Ar. 拉米杜斯.拉米杜斯.拉米杜斯.拉米杜斯.拉米杜斯.拉米杜斯
- 为了比较Ar. 拉米杜斯的牙与其他原始人如奥斯特拉洛皮塞克斯 (Australopithecus) 和潘.
- 为了推断阿尔的饮食利基和性二态. 拉米杜斯.拉米杜斯.拉米杜斯.拉米杜斯.拉米杜斯.拉米杜斯
主要方法:
- 从Ar. 分析相关的上和下牙. 拉米杜斯样本.
- 牙形态和磨损模式的比较评估.
- 对ARA-VP-6/500标本的骨架分析.
主要成果:
- 这就是Ar的意思. 拉米杜斯没有狗后巨; 牙比奥斯特拉罗皮铁克斯更薄,更不耐用的面膜.
- 牙形态和磨损与部分陆地动物,万食动物/果食动物的饮食相一致.
- 这就是Ar的意思. 拉米杜斯犬体大小和磨练能力减少,其犬体大小和形状近乎单态; ARA-VP-6/500是雌性.
结论:
- 这就是Ar的意思. 拉米杜斯代表了人类进化的早期阶段,具有独特的牙特征.
- 这种物种很可能有混合饮食,并且在犬类中减少了性二态.
- 早期的原始人进化涉及到犬体大小和功能上的重大变化.
相关概念视频
01:15Teeth
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
02:56The 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...
01:21Tooth Anatomy
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.