Anthropologists have built a "Frankenstein" Neanderthal skeleton, the first and only full-body reconstruction of the species. The result, announced today, is a shape no one expected.

"It’s almost like making my own fossil discovery," said Gary Sawyer, one of the skeleton’s architects.

Sawyer, an anthropologist at the American Natural History Museum in New York, and his colleague Blaine Maley of Washington University, pieced together the skeleton using bones mostly from an individual known as La Ferrassie 1.

La Ferrassie 1 was missing its rib cage, pelvis, and a few other parts, so Sawyer and Maley had to scrounge around to find some parts.

"The missing parts had to come from another classic Neanderthal that was similar, if not identical, in size to the La Ferrassie man," Sawyer told LiveScience in a phone interview.

The spare parts came from Kebara 2, a 60,000-year-old skeleton discovered in Israel in 1983. Kebara 2 was previously known as the specimen with the best rib cage, pelvis, and vertebral preservation.

The La Ferrassie man was discovered in France in 1909 and is about 70,000 years old.

Sawyer said the replacement bones are remarkably similar in size to La Ferrassie man - most were off by only a few millimeters.

Still, as the scientists pieced together the bones, something didn’t look quite right. A rotund, bell-shaped torso, produced by a flared lower ribcage, and a pelvic region that looked slightly wide and feminine, began to form in front of their eyes.

"The biggest surprise by all means is that they have a rib cage radically different than a modern human’s rib cage," said Sawyer. "As we stood back, we noticed one interesting thing was that these are kind of a short, squat people. These guys had no waist at all - they were compact, dwarfy-like beings."

Other bits and replacement pieces, mostly the ends of bones, were collected from half a dozen other Neanderthals. The remaining gaps were filled in with reconstructed human bones.

How an average Neanderthal male (left) compare to a human male. Brain size is in cubic centimeters.

The Big Picture

The finished product is "like Frankenstein," Sawyer said.

Even though the reconstructed fossil is made up of both Neanderthal and human bones, Sawyer doesn’t believe that modern humans could have evolved from Neanderthals based on the pelvic and torso discrepancies between the two species.

Evolutionary side road

"There is no way that modern humans, I believe, could have evolved from a species like Neanderthal," Sawyer said. "They’re certainly a cousin - they’re human - but they’re one of those strange little offshoots."

The reconstructed Neanderthal skeleton is currently on display at the Dolan DNA Learning Center in Cold Spring Harbor, NY. It will eventually go on permanent display at the American Museum of Natural History.

This research will be published in the March 11 issue of the Anatomical Record Part B: The New Anatomist.

Neanderthals were a relative of homo sapiens that co-inhabited Europe and parts of western Asia with hum from about 120,000 to 29,000 years ago. They were well adapted to the cold and were very muscular — good traits for hunting large animals.

"They had very strong hands," Sawyer said. "If you shook hands with one, he would turn your hand to pulp."

source: LiveScience

Neanderthals are often thought of as the stray branch in the human family tree, but research now suggests the modern human is likely the odd man out.

"What people tend to do is draw a line from our ancestors straight to ourselves, and any group that doesn’t seem to fit on that line is divergent, distinct, unusual, strange," researcher Erik Trinkaus, an anthropologist at Washington University in St. Louis, told LiveScience today. "But in terms of evolution of our family tree, the genus Homo, we’re the outliers and the Neanderthals are more toward the core."

Humans are not at the inevitable end of a sequence, Trinkaus said. "It just happens that we happen to be alive today and Neanderthals are not."

Trinkaus spent decades examining fossil skeletons and over time realized that maybe researchers looked at Neanderthals the wrong way. Over the last two years, he systematically combed through fossils, comparing Neanderthal and modern human skull, jaw, tooth, arm, leg traits with those of the earliest members of the genus Homo in terms of their shape.

"I wanted to see to what extent Neanderthals are derived, that is distinct, from the ancestral form. I also wanted to see the extent to which modern humans are derived relative to the ancestral form," Trinkaus said.

Trinkaus focused on skeletal features that seemed most strongly linked to genetics, as opposed to any traits that might get influenced by lifestyle, environment or wear and tear.

When compared with our common ancestors, Trinkaus discovered modern humans have roughly twice as many uniquely distinct traits as Neanderthals. In other words, Neanderthals are more like the other members of our family tree than modern humans are.

"In the broader sweep of human evolution, the more unusual group is not Neanderthals, whom we tend to look at as strange, weird and unusual, but it’s us, modern humans," Trinkaus said.

Modern humans, for example, are the only members of our family tree who lack brow ridges, Trinkaus said. "We are the only ones who have seriously shortened faces. We are the only ones with very reduced internal nasal cavities. We also have a number of detailed features of the limb skeleton that are unique."

Trinkaus published his findings in the August 2006 issue of the journal Current Anthropology.

source: LiveScience