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...published in the Oct. 2 special issue of Science - 11 papers by a total of 47 authors from 10 countries - researchers unveiled Ardi, a 125-piece hominid skeleton that is 1.2 million years older than the celebrated Lucy (Australopithecus afarensis) and by far the oldest one ever found. Tim White of the University of California, Berkeley, a co-leader of the Middle Awash research team that discovered and studied the new fossils, says, "To understand the biology, the parts you really want are the skull and teeth, the pelvis, the limbs and the hands and the feet. And we have...

Author: /time Magazine | Title: Ardi Is a New Piece for the Evolution Puzzle | 10/1/2009 | See Source »

Ardi is the earliest and best-documented descendant of that common ancestor. But despite being "so close to the split," says White, the surprising thing is that she bears little resemblance to chimpanzees, our closest living primate relatives. The elusive common ancestor's bones have never been found, but scientists, working from the evidence available - especially analyses of Australopithecus and modern African apes - envisioned Great-Great-Grandpa to have looked most nearly like a knuckle-walking, tree-swinging ape. But "[Ardi is] not chimplike," according to White, which means that the last common ancestor probably wasn't either. "This skeleton...

Author: /time Magazine | Title: Ardi Is a New Piece for the Evolution Puzzle | 10/1/2009 | See Source »

...what does that mean? Based on Ardi's anatomy, it appears that chimpanzees may actually have evolved more than humans - in the scientific sense of having changed more over the past 7 million years or so. That's not to say Ardi was more human-like than chimplike. White describes her as an "interesting mosaic" with certain uniquely human characteristics: bipedalism, for one. Ardi stood 47 in. (120 cm) tall and weighed about 110 lb. (50 kg), making her roughly twice as heavy as Lucy. The structure of Ardi's upper pelvis, leg bones and feet indicates she walked upright...

Author: /time Magazine | Title: Ardi Is a New Piece for the Evolution Puzzle | 10/1/2009 | See Source »

...details of social behavior is, admittedly, speculative - and several researchers are quick to note that some of the authors' other major conclusions need further discussion as well. One problem is that some portions of Ardi's skeleton were found crushed nearly to smithereens and needed extensive digital reconstruction. "Tim [White] showed me pictures of the pelvis in the ground, and it looked like an Irish stew," says Walker. Indeed, looking at the evidence, different paleoanthropologists may have different interpretations of how Ardi moved or what she reveals about the last common ancestor of humans and chimps...

Author: /time Magazine | Title: Ardi Is a New Piece for the Evolution Puzzle | 10/1/2009 | See Source »

...special issues very often, and the extraordinary number and variety of fossils described in these new papers mean that scientists are arguing over real evidence, not the usual single tooth here or bit of foot bone there. "When we started our work [in the Middle Awash]," says White, "the human fossil record went back to about 3.7 million years." Now scientists have a trove of information from an era some 700,000 years closer to the dawn of the human lineage. "This isn't just a skeleton," he says. "We've been able to put together a fantastic, high-resolution...

Author: /time Magazine | Title: Ardi Is a New Piece for the Evolution Puzzle | 10/1/2009 | See Source »

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