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Early Human-Like Skeletons Are First Outside of Africa
Date:9/19/2007

volume -- less than half that of modern Homo sapiens.

To Laitman, all of this means that, "If you were going to go on a long trip, you didn't have to be a genius -- but you did need good feet."

This "mosaic" of features -- some more human-like than others -- means the Georgia researchers have been careful not to give their skeletons a specific taxonomic label, such as Homo habilis or erectus. "You're not yet having anyone saying which drawer in the museum desk these bones should be placed in," Laitman noted.

And there's some controversy over the researchers' conclusions.

Trinkaus, for one, disputes the notion that the specimens' highly flexible upper arm points away from Homo and toward the australopiths. "That's something that is actually extremely variable even in modern humans," he said. "It's a developmental thing that's dependent on activity patterns."

Even less is known about how the Dmanisi individuals lived. The researchers speculate that they gained food from hunting and scavenging, and stone tools have also been found in the area. But much remains unknown.

Still, everyone agrees that having even partial skeletons helps fill in the historical record.

"There's just a whole lot more that you can do when you have an associated skeleton, even if it's incomplete," Trinkaus said.

More information

Find out more about human evolution at Minnesota State University.



SOURCES: Jeffrey Laitman, Ph.D., professor and director, anatomy, Mount Sinai School of Medicine, New York City; Erik Trinkaus, Ph.D., Mary Tileston Hemenway Professor in Arts & Sciences, Physical Anthropology, Washington University, St. Louis; Sept. 20, 2007, Nature


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