Lucy and Selam up on tree species: Australopithecus Afarensis shoulder blade part Arboreal Lifestyle Show
Australopithecus afarensis (the famous "Lucy" skeleton species) species was a direct run, but also spend a lot of time in the trees than the question has been debated, partly because a full set of shoulder afarensis . Blade has never been available for study.
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For the first time, Midwestern University professor David Green California Academy of Sciences, Zeresenay Alemseged, curator of anthropology at the well two fossil A. afarensis's "Selam," a rare skeleton well preserved complete shoulder blade is checked, Dikika children from Ethiopia in 2000, discovered by Dr. Alemseged. Preparation of more detailed analysis of these rare bones shows them very apelike, this species also running bipedally on the ground was adapted to climbing trees. "What Australopithecus afarensis was bipedal strictly tree is up or if they strongly debated question for more than thirty years," Dr. Green said. "This remarkable fossils is strong evidence that these people still climb was at this stage in human evolution provide."
In the October 26 issue of the journal Science the new results are published.
Dr. Alemseged, Christopher Kiarie Kenya to help lab technicians, spent 11 years carefully skeletons, encased in a block of sandstone was removed from the rest of the shoulder blade. "The shoulder blades are paper thin, they rarely fossilize - and when they do, they are almost always broken," said Dr. Alemseged.is. "It seems that many researchers since it was first suggested."
A three-year-old Selam A. afarensis girl who lived 3.3 million years ago, and it's such represents the most complete skeleton. Around the stone, green, free and Alemseged DIGITIZED the shoulder blades using a Microscribe, and then measure the detailed properties of their form and function, other relatives early human fossils rare in shoulder Comparison: Homo ergaster ("Turkana Boy"), Homo ("Hobbit") floresiensis, A. africanus, and A. Two adult afarensis specimens. He juvenile and adult chimpanzee, gorilla, orangutan, and a comprehensive modern human samples compared with samples.
Bones form and function analysis revealed that A. afarensis shoulder blades are apelike, indicating partially arboreal lifestyle. Drs. Alemseged green and also found that living like monkeys, A. afarensis representatives of juvenile and adult anatomy of the shoulder was the same way. "Significantly different from the closely related simian human scapulae change throughout ontogeny in a manner, form," Dr. Green said. That 'we the adult Australopithecus afarensis Selam scapula compared with members, it was clear that the development is consistent with the pattern of monkeys with humans. "In a time when most researchers agree that A. afarensis hip bone, lower limbs, and feet and unequivocally humanlike features many custom is to walk straight." This important new search place that Lucy and Selam's species occupy confirmed in human evolution, "said Dr. Alemseged., he said, though still a human bipedal A. afarensis was born as a human being, although not completely, A. afarensis This clearly was on.
