Sahelanthropus tchadensis and Orrorin Tugenensis

[Name of the Institute]Sahelanthropus tchadensis and Orrorin Tugenensis

Introduction

Sahelanthropus tchadensis and Orrorin Tugenensis are two of the most important species discovered. The species had distinctive features and characteristics, which have been studied by analysts. Both of the species belong to the hominid, which is a primate that incorporates humans and their fossil ancestors. Sahelantrophus tchadensis is the remains of one of the oldest hominid found in the desert lands of northern Chad, near the southern edge of the Sahara. On the other hand, Orrorin tugenensis is another ancient bipedal hominid discovered on October 25th, 2000 during excavations in Kenya near the Great Rift Valley. The study will discuss and contrast the two species in detail.

Discussion

Sahelanthropus Tchadensis

Sahelanthropus tchadensis is a species of hominid extinct whose fossils were found in the desert Djurab by a French team tchadiense. The only specimen, nicknamed Toumaï, has been dated in 6 to 7 million years old. He became known publicly in N'Djamena, the capital of Chad. His discovery was made ??on 19th July 2001 by a team led by Alain Beauvilain in the region of the current Bulls Menalla Republic of Chad, near the place where, in 1995, he found the Australopithecus bahrelghazali. We ruled out its relationship with apes because their features do not correspond to any previous ape if much closer hominins.

It is believed to have lived in swampy areas. His skull is ape and small, short-faced, but small teeth, particularly the canines, which comes close to human. His bow is very prominent supraorbital. A skull was found with two lower jaw fragments and three isolated teeth. No cranial crest, brain volume is approximately 350 cm ³, similar to chimpanzees and modern much lower than in humans (1350 cm ³). It has high and low prognathous face, canines relatively small, and no space between the teeth. It could be the ancestor of Ardipithecus ramidus.

Ancestry

Michel Brunet, who discovered Toumai, believes that it belongs to the branch of hominina, near the common ancestor with the chimpanzee, but the line to humans, derived characters found in the teeth of Tournai, is follows that part of the human branch. However, others, like Yves Coppens (team discovered Lucy) or Brigitte Senut (which prompted the discovery of Orrorin tugenensis) Toumai think it belongs to the branch leading to chimpanzee.

Description

The front part of the skull combines a very primitive and relatively advanced features (in particular, the rather weak canines), and his teeth are markedly different from other findings. The size of the brain is very small (~ 350 cc.). It is an elongated skull, which is typical, rather, for the monkeys. This mosaic of features suggests the earliest stages of evolution of the group. In addition to the skull, fragments were found of the remnants of five other individuals. In July 2002, an international team of 38 scientists have described him to a new genus and species of hominid Sahelanthropus tchadensis. Analysis of the fossils collected at the sahelantropom, suggests that once there was a large bank of ...