New human ancestor?
You mean "newly found old human ancestor ? "
What dictates these findings is where the right aged rock structures are already on the surface. This has led to all sorts of rubbish about possible migrations and so forth. Just because you find a fossil in one place doesnt mean they are only found there or that there were any more than a few of them. It takes about 3-5,000 years to make a new bird species, and with a long track record like we have, there are many more to find somewhere.
One of the criteria used is the number of differing key points of anatomy to determine if it is a different species or not. Great deal about nothing is made if they find a fossil and it doesnt have enough bone to distinguish it. Heated arguments develop about where to place it and these are never resolved, even if it does have enough bone, simply some opinions win out and become mainstream whilst others are relegated to the back row of the auditorium if they get invited at all.
I think it is fairly well established that our ancestral tree had many branches and it will be hard to lay these in any kind of line to determine our lineage for quite some time to come.
But dont you just love it when they release these things to the press ? The articles are so more interesting then dry journal papers. I cant wait for the documentary....
Good post littlek !