Yes, speciation and determining when it actually happened is a tricky question and what a species mean don't seem to have one unambigious answer. It's more or less a label we humans need to be able to discuss these things using abstract language. In a funny way it seems something instinctively understood and when you look closer, it's a very complicated question. Thanks for your answer.
Godfrey-I was about to suspend this account---common practice when we first see spam-- but after reading your webpage, I was feeling lenient enough to get to know you. If your name really is Godfrey Oswald, our ears are open. Testing, One Two Three...
If there is a common ancestor to Tram Law, Desmond tutu and Akira Kurosawa, has it been found? If not, should that call into question the existence of their common ancestor?
building on what Coyote said:
One common ancestor for those three would be the first anatomically modern Homo sapiens sapiens, which is dated to about 200,000 years ago. Specimens have been found.
We also have the genetic \ migration maps that shows ancestry through time, and these converge on their respective common ancestor populations (everyone has two parents not one common ancestor, and thus it is more exact to talk about populations than individuals).
Yes, obviously specimens of Homo Sapiens have been found.
I was more thinking along lines it's an analogy to asking for a common ancestor species of all apes. Since my examples were single individuals, the common ancestor would also be a single individual. And it's just as clear to me that like we don't (not even creationists) doubt there is a common ancestor for modern humans, there's no reason to doubt there's an ancestral species to modern apes, whether it can be found and identified is irrelevant.