Dead wrote:
"To be totally correct it's a taxonomic group whose members can interbreed to produce offspring that can also breed. Lions & Tigers can breed, as can donkeys and horses, but the offspring are sterile. However this ability is a pretty good indication that lions & tigers and donkeys & horses had common ancestors in the not too distant (in evolutionary terms) past."
Well, 'interbreed' implies that the offspring can breed themselves. I should have been more clear.
I will now. We're talking about a clandistic taxation here. The criterion for grouping things together is the closeness of cousinship or relative recency of common ancestry. As such, this taxonomy is not one seen for instance in public libraries where a classification is arbitrary - in clandistic taxonomy one can say whether a classification is *right or wrong*. Much more info can be found in 'The Blind Watchmaker, R. Dawkins, chapter 'The One True Tree Of Life''.
Hortlund wrote:
You know Santa...that is one big post saying pretty much "Yeah, we know that we haven't found any transitional fossils, but we're going to ignore that (because we have lots of excuses as to why we havent found any) and pretend that we did."
Over to your sharks Santa. You do realize that just because someone on a website lable them transitional fossils, that doesnt neccesarily make it so? But anyway, could you please point out what of those fossils that you listed that are transitional in your opinion? From a quick read, I could not find a single one that would appear to be transitional.I offer you the science explanation of the trouble with fossils in general. If you're not capable of understanding why this represents problems with obtaining transitional fossils that IS a problem. Evidence suggests that these transitional being existed only for a very short while (on the evolution scale) which further decreases the likelihood of finding transitional fossils. Then there is the human problem of sorting through all the stuff. You dismiss that too. It seems you dismiss without knowing, which is a creationist approach - but that is your prerogative. To suggest that there aren't any transitional fossils is just non educated nonsense though.
Ok, I'll give you something to peruse at your leisure, as it seems I am unable to educate you about quite simple things like strata, fossils and the problems involved.
Here is an example of speciation (i.e the transition from one species to another) supported by paleontolic evidence. It's dry reading though (read it myself at the public library a couple of years ago).
Carroll, R. 1988. Vertebrate Paleontology and Evolution. W.H.
Freeman & Co., New York. Chapter 22 for transitions.
Tetrapods are rather well documented, so that's a good source.
Benton, M.J. (ed.) 1988. The Phylogeny and Classification of the
Tetrapods. Clarendon Press, Oxford.
A reference to my shark/fish cut/paste:
Coates, M.I., & J.A. Clack. 1991. Fish-like gills and breathing in the earliest known tetrapod. Nature 352:234-236.
Alternatively, visit
this link for a detailed list of references. Your assumption that I'm talking utta my arse is erroneous, but I should have provided references for you.
Now I must not disturb you anymore, as you have a lot of reading to do. Enjoy. And you'll understand what I mean when I say that speciation and so forth is buried deep within boring litterature.