Posted on 09/20/2006 10:26:20 AM PDT by aculeus
The 3.3-million-year-old fossilised remains of a human-like child have been unearthed in Ethiopia's Dikika region.
The female bones are from the species Australopithecus afarensis , which is popularly known from the adult skeleton nicknamed "Lucy".
Scientists are thrilled with the find, reported in the journal Nature.
They believe the near-complete remains offer a remarkable opportunity to study growth and development in an important extinct human ancestor.
The skeleton was first identified in 2000, locked inside a block of sandstone. It has taken five years of painstaking work to free the bones.
"The Dikika fossil is now revealing many secrets about Australopithecus afarensis and other early hominins, because the fossil evidence was not there," said dig leader Zeresenay Alemseged, of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.
Delicate bones
The find consists of the whole skull, the entire torso and important parts of the upper and lower limbs. CT scans reveal unerupted teeth still in the jaw, a detail that makes scientists think the individual may have been about three years old when she died.
Remarkably, some quite delicate bones not normally preserved in the fossilisation process are also present, such as the hyoid, or tongue, bone. The hyoid bone reflects how the voice box is built and perhaps what sounds a species can produce.
Judging by how well it was preserved, the skeleton may have come from a body that was quickly buried by sediment in a flood, the researchers said.
"In my opinion, afarensis is a very good transitional species for what was before four million years ago and what came after three million years," Dr Alemseged told BBC science correspondent Pallab Ghosh.
"[The species had] a mixture of ape-like and human-like features. This puts afarensis in a special position to play a pivotal role in the story of what we are and where we come from."
Climbing ability
This early ancestor possessed primitive teeth and a small brain but it stood upright and walked on two feet.
There is considerable argument about whether the Dikika girl could also climb trees like an ape.
This climbing ability would require anatomical equipment like long arms, and the "Lucy" species had arms that dangled down to just above the knees. It also had gorilla-like shoulder blades which suggest it could have been skilled at swinging through trees. But the question is whether such features indicate climbing ability or are just "evolutionary baggage".
The Dikika girl had an estimated brain size of 330 cubic centimetres when she died, which is not very different from that of a similarly aged chimpanzee. However, when compared to the adult afarensis values, it forms 63 - 88% of the adult brain size.
This is lower than that of an adult chimp, where by the age of three, over 90% of the brain is formed. This relatively slow brain growth in the Dikika girl appears to be slightly closer to that of humans.
Slow, gradual development in an extended childhood is regarded as a very human trait - probably to enable our higher functions to develop.
Professor Fred Spoor of University College London said the find would give scientists a "detailed insight into how our distant relatives grew up and behaved... at a time of human evolution when they looked a good deal more like bipedal chimpanzees than like us."
The "Lucy" skeleton, discovered in Hadar, Ethiopia, in 1974 belongs to the same species as the Dikika girl. For more than 20 years it was the oldest human ancestor known to science.
Published: 2006/09/20 17:05:09 GMT
© BBC MMVI
Bwhahahaha.
Best post of thread.
(And I like your tagline, too. Not altogether feeling brotherly with the JINOs on TV, though.)
Ya sure got that right....;D
Maybe a DINGO ate Lucy's babee!
Angelina has already collected an Ethiopian for her "Children of the World" collection.
(Save the children- get the whole set)
Once she recovers from her reported PPD, She is now scouting out countries that allow adoptions by unwed mothers of multiples with past histories of self mutilation, promiscuity, incest?, and bisexuality.
What "missing link" are you referring to?
Most Christians believe it is the human soul that is created in "God's image", not the body.
Hovind said so. Ain't that good enough? ;-)
Yes the base of the tongue is attached to it. And it is basically a freestanding bone it doesn't articulate with any other bone but is suspended by cartilage. I got a "B" in Anatomy and Physiology last semester.
"I got a "B" in Anatomy and Physiology last semester."
Good job! It's not an easy class.
I just finished listening to the NPR story on this, and I will post it as soon as it becomes available.
YEC INTREP
It's a MONKEY!
I was just thinking that , too. Gotta be here somewhere.
A monkey that walks upright?
A monkey with a brain that large?
A monkey with teeth very like a human being (and yet a little bit chimp-like)?
A monkey with no tail?
What definition of "monkey" does this creature meet, that you or I don't also meet?
Taylor: "You're talking heresy."
Dr. Zaius: "Of course!"
Excellent, but I suggest you delete "Lucy" from the headline to avoid the parade of FR "wits" making the same sort of lame comments that blight this thread.
No.
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