Ardipithecus Ramidus Essay

488 Words2 Pages
Ardipithecus ramidus Ardipithecus ramidus or “Ardi” was discovered by Tim White and his colleagues in 1992. They discovered the female skeleton in Aramis, Ethiopia. The bones were so fragile that whole blocks of stone surrounding them had to be transported to the national museum in Ethiopia, and were excavated there. The bones were then analyzed and reconstructed using CT scans. Ardi is estimated to be 4.4 million years old and is considered to be one of the most primitive hominids, giving rise to the species Australopithecus, which in turn gave rise to Homo sapiens. She is the closest we’ve come to finding the last common ancestor of chimpanzees and humans. Since the skeleton did not contain useful material for dating methods, scientists measured the amounts argon gas in the ash layers the skeleton was found between. Ardi is the most complete of the Ardipithecus fossils found. Her skeleton includes her skull, teeth, arms, hands, pelvis, legs, and feet. She stood at almost 4 feet tall and weighed about 110 pounds, similar in size to a chimpanzee. She had a short, broad pelvis with a long, curved spine like modern humans. She had long arms, short legs, and a relatively small, chimp-sized brain. Her upper arm bone was non weight-bearing, and her wrist and finger joints were highly flexible, unlike chimps and gorillas that have rigid joints for knuckle walking. While she had a flared upper pelvis, which is human-like, her lower pelvis was more apelike to accommodate large hind limb muscles for climbing. Her large toe was opposable, and off to the side, helping with stabilization and use of an arboreal environment. This evidence suggests that the last common ancestor between chimpanzees and humans was not a knuckle walker. This finding could not have been predicted from a modern human or chimpanzee. Based on her skeletal features she could climb trees, use fingers

More about Ardipithecus Ramidus Essay

Open Document