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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.
"This individual was fully bipedal and had the ability to walk almost like modern humans," said Haile-Selassie. "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, explained, "The new specimen tells us much more about the pelvis, thorax, and limb proportions than 'Lucy' was able to alone."
Authors of the research include Dr. Bruce Latimer, director of the Center for Human Origins at Case Western Reserve University; and Dr. Beverly Saylor, associate professor of geological sciences at Case Western Reserve University.
Source: Cleveland Museum of Natural History
Photo: Cleveland Museum of Natural History