Lucy's Family is Complete: Hominid Trio Offer Insight Into Human Evolution
June 22, 2010 10:38 AM
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An artist's scupting of A. afarensis, based on the earlier Lucy skeleton.
(Source: Educa Madrid)
The bones of "Big Man"
(Source: Y. Haile Selassie et al./PNAS 2010)
"Whatever we’ve been saying about afarensis based on Lucy was mostly wrong."
Much like the revolution of modern astronomy in the late 1400s and early 1500s dissolved the notion that the Sun revolved around the Earth, a renaissance in paleontology is dissolving virtually any doubt that remained about man's origins. Another new discovery has just been completed, the latest of several high profile publications over only the last year.
is a male
, which has been discovered in Ethiopia’s Afar region. The skeleton joins the celebrated "Lucy" skeleton, unearthed by paleoanthropologists in 1974, and a child skeleton unearthed last year.
The ancient male, an ancestor of modern man, lived approximately 3.6 million years ago in the plains of Eastern Africa, according to several dating techniques. Yohannes Haile-Selassie of the Cleveland Museum of Natural History, who led the team, says the skeleton offers some major new insights into the species.
The skeleton has been nicknamed "Big Man" as it towers at 5 to 5½ feet tall over the much shorter 3½-foot-tall Lucy, who lived 3.2 million years ago. That large height deviation raises questions over which of the specimen is the norm in terms of height. The new skeleton was unearthed between 2005 and 2008 at a dig site only 48 km from where Lucy was found.
The skeleton also reveals new insights into the bone structure of the species. Big Man's 32 discovered bones reveal long legs, a narrow chest, and a inwardly curving back. All of these indicate that he walked much like a human and enjoyed a ground-based lifestyle. This is very different from the awkward gait that Lucy was thought to have. Lucy also had been thought to climb trees a great deal.
The shoulder blade of Big Man is quite different from chimpanzees or gorillas. And the ribs also appear human-like. All of these factors indicate a far different chest shape than the chimplike, funnel-shaped chest that reconstructions of the Lucy skeleton indicated.
While confusing perhaps in context with Lucy, the conclusion that ancient hominids were
chimplike is consistent with the analysis of the
that was conducted last year.
Professor Haile-Selassie states, "Whatever we’ve been saying about
based on Lucy was mostly wrong. The skeletal framework to enable efficient two-legged walking was established by the time her species had evolved."
Carol Ward of the University of Missouri in Columbia seems to agree with these conclusions, stating, "This beautiful
specimen confirms the unique skeletal shape of this species at a larger size than Lucy, in what appears to be a male."
While the discovery may have cleared up debate about whether Lucy was more chimplike or humanlike, the debate about gait is sure to continue. Harvard University anthropologist Daniel Lieberman states, "There’s nothing special I can see on this new find that will change anyone’s opinion."
Anthropologist Owen Lovejoy of Kent State University, however, believes that the discovery shows Big Man to be a good runner, which could have made the 3.6-million-year-old footprints found more than 30 years ago at Laetoli, Tanzania. Among the evidence supporting this hypothesis are Big Man's pelvis supported humanlike hamstring muscles and human-like arched feet.
The full study on the Big Man discovery is published
in the journal
Proceedings of the National Academy of Sciences
A separate 3.3 million year old skeleton of a 3-year-old baby female
was presented four years ago. Nicknamed "Selam" (the word for "peace" in several African languages), the near-complete skeleton was found in 2000 south of the Awash river by a team led by Zeresenay Alemseged of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.
The paper on that discovery was published in a 2006 edition of
and can be found
These discoveries add to the aforementioned recent discovery of "Ardi", the
, and the completion of an early
draft of the Neanderthal genome
. All of these wonderful discoveries have helped to blow away the fog of uncertainty surrounding human evolution and offered a much clearer picture of how man arrived at its current form after a slow process of evolution that took millions of years.
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6/22/2010 2:10:10 PM
Why do some people always want to attack religion? I suppose Francisco Ayala who is a Christian and one of the leading experts on evolution, should realize how dumb and intolerent he is. He has debated William Lane Craig on evolution and both seem to believe that evolution and religion are compatible. Another strong Christian who believes in evolution is Dinesh De'souza. A alternate view can also be found from Reasons.org scientists such as Fuz Rana. Many in the Catholic Church also believe in evolution.
I can understand that some want to act as though Christians are stupid, but the facts from leading scientists only make life more interesting.
RE: So What
6/22/2010 5:57:30 PM
Why do some people always want to attack religion?
Most of the attacks you see online are directed against Christianity. I'm aware that many atheists have disparaging things to say about religion in general, but few religions are attacked as viciously as Christianity is. Just take a look at this thread and count how many comments ridicule Christians vs how many comments target Muslims or Buddhists.
Jesus Himself predicted that this would be the case. There is an innate hostility in man towards God (i.e. the natural man lives in rebellion against God) and you see this reflected in the secular man's attitude towards God's people. God has called the Christians out of this world to live apart from the ways of the world, and preach the gospel, but this preaching of the gospel offends the unbelievers.
The attitude of the non-believers testifies to the power of the gospel. If Christianity were just some fairy tale, it would be no threat, nor taken seriously, and it wouldn't be attacked like it is.
RE: So What
6/22/2010 6:19:49 PM
I am an unbeliever, yet Christianity does not offend me nor do I attack it.
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