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雑学

The oldest "ancestor of mankind" is Ardi (Ramidas monkey man), not Lucy

The whole body skeleton of the Ramidas monkey man 4.4 million years ago was reproduced. This is an epoch-making research that overturns the previous theory.
Height 120 cm, weight 50 kg.

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[According to a group of researchers who restored full-body images from fossils found in Ethiopia since 1992] Ardi is the famous fossil human bone "Lucy", which was recognized as the first monkey to belong to the human race. It is possible that he was walking upright more than a million years ago.

The status of "the first ancestor of mankind" is now Aldi's, not Lucy's, but this is more than just a superficial rewrite of mankind's genealogy. Since the discovery of Lucy, human origin has been attributed to the savanna [a tropical grassland with woodlands and shrubs], but Ardi is believed to have inhabited the woodlands. In addition, scientists have determined from Lucy's skeleton that the last common ancestor of humans and other apes resembles a chimpanzee, but Ardi's discovery denies that decision.

Ramidas monkeys such as Ardi are from an era before Afar monkeys (Australopithecus afarensis) such as Lucy. Some of Lucy's ancestors branched into a race millions of years ago and are now chimpanzees and bonobos. It is possible that the Ramidas monkeys are not of the origin of all hominids, but of the hominids that later became humans.

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Since Darwin, most scientists have speculated that the last common ancestor of humanity, chimpanzees, and gorillas is "similar to chimpanzees." This idea was supported by the fact that the chimpanzee's DNA was 99% consistent with human DNA, and that the chimpanzee had many of Lucy's skeletal features.

However, Ramidas monkeys have few of the typical characteristics of chimpanzees, such as the large canines of males. Researchers say this indicates that the Ramidas monkeys no longer perform the very aggressive social behaviors found in chimpanzees at an early stage. [Reduction of canines is a major feature of humankind]. These indicate that chimpanzees and large primates have undergone significant mutations since they branched off from humans.

[According to Gen Suwa, a professor at the University of Tokyo, who first discovered the fossil of Ramidas monkey man and participated in this research, "chimpanzees perform suspension movements on trees and attach the middle finger of their front limbs to the ground on the ground. However, Ramidas has no remnants of such characteristics and seems to have evolved from an ancestor that is quite different from chimpanzees. "]

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"Previous studies have tended to see Australopithecus as a link between monkey-like ancestors and early humans, but the Ramidas monkeys overturn these assumptions," said C. Kent State University. . Owen Lovejoy states in the Science paper.

The legs of the Ramidas monkey, who has no arch and large toes like a thumb, can "grab" and climb trees, but the pelvis seems to be suitable for erect bipedalism. Ardi seems to have adapted to life on trees and on earth. However, there are some disagreements with the bipedal walking theory.

["Lucy" is a fossil about 3.2 million years old, and has been regarded as the oldest human skeleton close to the whole body. Human fossils older than the Ramidas monkeys 4.4 million years ago include Sahelanthropus chadensis (about 7 million years ago) found in Chad and Orrorin Tugenensis (about 6 million years ago) found in Kenya. Partial, not well understood about appearance and life]

-雑学