All this means very little, as impressive as it seems. How many posts by yourself and PW have been put up outlining the evolution of the knuckle walking hands into human. It appears that this topic is now well outdated. Indeed recent research by Lovejoy and many other scientists have shown strong evidence that we did not evolve from chimpanzees at all. Also that knucklewalking evolved independently. All these skulls you have posted showing the gradual changes from chimp to human are extremely outdated and misleading. At the very least these single minded posts do not acknowledge the full body of research, yet many of you continue to maintain that these fossil skulls are some sort of undeniable evidence of ancestry from the chimpanzee. Many researchers now disagree with this mainstream idea. That is how solid the evidence actually is.
You guys/gals really need to stop shoving this style of evidence in peoples faces.
Now all these skulls you have posted will need to be 'fitted in' with another line of ancestry that does not come directly from the chimp line. So this information is mute and of no value at all.
Earth Magazine Oct '09: Before Lucy: Older hominid Ardi challenges thinking about human evolution
Lucy, the 3.2-million-year-old
Australopithecus afarensis fossil, has long been the poster child for early human evolution. But now shell have to share the spotlight with an even older hominid. After spending the last 15 years studying an ancient hominid species about the size of a chimpanzee, scientists revealed details about the 4.4-million-year-old
Ardipithecus ramidus in a press conference today. Despite the similarity in size,
Ardipithecus didnt look or act like a chimpanzee, which the researchers say suggests that the last common ancestor of chimpanzees and humans was not chimpanzee-like either. As a result, they said, scientists may need to rethink some long-standing ideas about the origins of the human family tree.
Many scientists thought humans evolved from an ape similar to chimpanzees and gorillas one that swung through the trees and knuckle-walked while on the ground. But this new information suggests that like
Ardipithecus the last common ancestor of chimpanzees, gorillas and humans also had a more primitive form of locomotion, the researchers say. Therefore, chimpanzees didnt evolve their specialized climbing and knuckle-walking until after they diverged from humans which also implies that chimpanzees and gorillas likely evolved this form of locomotion independently
as other recent research has suggested.
But the bones also paint an unexpected picture of an early hominid: Despite its bipedalism,
Ardipithecus was more primitive than chimpanzees in many ways negating the idea that the last common ancestor of chimpanzees and humans was chimpanzee-like, as some scientists have assumed. For example,
Ardipithecus ramidus was not an arboreal acrobat like chimpanzees and gorillas, the researchers say. Chimpanzees and gorillas rely on their long, strong arms and hands, their curved fingers and their grasping feet to climb trees, swing through the canopy and hang from branches while feeding. But
Ardipithecus lacked those features: Instead, it walked on all fours on top of the tree branches, similar to how monkeys move through the trees
As for the environment, theres no doubt that [
Ardipithecus] was adapted for an arboreal lifestyle, Ward says. But where Lovejoy, White and their colleagues see primitive, monkey-like climbing, Richmond still sees typical chimpanzee- and gorilla-like features. The hands and feet look like an ape, he says. They would have been capable of climbing the way chimps and gorillas climb.
Still, with all of this new evidence, the idea that we came from a chimp-like ancestor is highly unlikely, Ward says. And therefore, given a different starting point, researchers will need to reframe many of the questions about how and why hominids started down the human path.
But this is hardly the end of the discussion and many more scientists are likely to weigh in on the fossils. Its an almost unprecedented collection of fossils, Ward says. Theres a tremendous amount of information in [them]
and decades of questions to be addressed.