davewhite04 said:
Nope.
I'm off to watch a flick, hopefully we can talk about this later.
OK, I'll answer Dave's question:
Can't say.
Seriously, what I can tell from looking at the teeny-tiny skull pictures on the jpg is that they are skulls, They generally do seem to go from small cranium-large jaw to large cranium-small jaw, they generally seem to have less brow and a rounder braincase as you go from A-N and the ones on the right seem happier than the ones on the left because they're nearer to seeing Pamela Anderson.
But are they
chronological ancestors? I don't think so, not all at any rate. I'm no anthropologist/human biologist, but as I recall Neanderthals aren't assumed to be lineal descendants of
H. h. sapiens any more anyway. The site could be - horror of horrors! - in error.
That, however, does not help.
Frankly, the fact that we've found more non-ancestrals (and, let's be honest, most of them in there probably are) than ancestrals is frankly to be expected. Think about it: just how many extinct lineages are there compared to extant (them whuts still livin') groups? So, frankly, you expect more "dead ends" (pardon the pun) in the record than direct ancestors. That said, the transitory forms and even more importantly the RANGE of transitory forms we have is remarkable.
Now, "Geoff," you say, "What do you mean RANGE of transitory forms?" Well now, that's simple, with a capital S and that means "Scopes". Well, not really. Anyway, the high ranges of homologous and paralogous development of limbs and jawbones (any one of which could kill a thousand Philistines, no doubt) and tails and feathers and not-feathers and so forth around any transitional period suggests a WIDE range of developmental alterations that could become - given chance and general selective advantage - speciative functions and lead to novel taxonomic groups. So if the general complaint is that one group of dinosaurs didn't quiiiiite lead to birds because they didn't have the right kind of holes in their heads or the derivation of their fingers is wrong, well take a big step back mother-may-I because high variation around these transitory points (only a dozen million years or so, give or take) means that there were a large number of taxa with similar modifications which might have been successful themselves. Again, we have trends derived from skeletal modifications. We don't have everything - that would be a neat trick, but we'd probably have to tear up the appropriate geographic layer over something like - oh, I don't know - THE ENTIRE FACE OF THE DRY EARTH in order to find the one freaky-do transitional that wouldn't take permeable membranous skin for an answer and decided to do something about it.
So consider: just how narrow a transitional band are we looking at here? And where did it emerge? Probably ONE place. Is that place under water, presently? Then kiss it goodbye, because we can't get at it. Given what we're left with, and how much of the fossil record we actually know about (1%), we're doing pretty damn well.
Ask us again at 10%.
:m:
Geoff