TECHNOLOGY
The partial skeleton belongs to Lucy's species, Australopithecus afarensis.
The discovery and the consequent analysis of an early hominid skeleton - 400,000 years older than the famous "Lucy" skeleton - suggests that advanced human-like, upright walking occurred much earlier than previously thought.
The Cleveland Museum of Natural History, Kent State University, Case Western Reserve University, Addis Ababa University and Berkeley Geochronology Center were part of an international team that discovered and analysed the 3.6 million-year-old partial skeleton found in Ethiopia.
The discovery and results from this initial analysis appear in the online early edition of the Proceedings of the National Academy of Sciences.
The partial skeleton belongs to Lucy's species, Australopithecus afarensis.
It was found in the Woranso-Mille area of Ethiopia's Afar region by a team led by first author Dr. Yohannes Haile-Selassie, Curator and Head of physical anthropology at The Cleveland Museum of Natural History.
The partial skeleton was excavated over five years after the discovery of a fragment of the lower arm bone in 2005.
The excavation recovered the most complete clavicle and one of the most complete shoulder blades ever found in the human fossil record.
The specimen was nicknamed "Kadanuumuu" (kah-dah-nuu-muu) by the authors.
"Kadanuumuu" means "big man" in the Afar language and reflects its large size. The male hominid stood between 5 to 5 1/2 feet tall, while "Lucy" stood at about 3 1/2 feet.
Haile-Selassie said: "This individual was fully bipedal and had the ability to walk almost like modern humans.
"As a result of this discovery, we can now confidently say that 'Lucy' and her relatives were almost as proficient as we are walking on two legs, and that the elongation of our legs came earlier in our evolution than previously thought."
Co-author Dr. C. Owen Lovejoy, Kent State University professor of anthropology, said: "The new specimen tells us much more about the pelvis, thorax, and limb proportions than 'Lucy' was able to alone."
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