Kotatsu
Phthirapterist
Earlier you said this guy Kleinman was here about five years ago. You have to go back five years to when we last heard from this type of creationist that we should be gearing our arguments toward? And only that there are "several"? You sure you're in touch with with typical creationists?
I also pointed out, I believe, that we haven't had any here for a while, yes. Kleinman wasn't the last one, but the use name of the last one I can remember escapes me (his real name was Davison, a biology professor from New England). These are the ones that have made the greatest impression on me in this forum, yes. But I only come back to this forum a few times a year, so I don't know if there have been more here since then. I meet them in other places, generally. I had one living with me every weekend for almost a year, until his girlfriend (whom he lived with during the weeks) threw him out and he gradually became a hare krishna and all my work was undone.
The tapir is not a good reply to the question: what living species represents a transitional form of elephant?
It is, however, a good reply to the question actually raised: what use could a shorter trunk be to a large land animal?
This is not the question actually asked, if we accept the claim that the OP is attempting to use creationist logic. The actual question asked is "What use would half a trunk be to an elephant?" Showing that a "fully formed" trunk is of use to a non-elephant does not answer that question.
And that's part of the point. Even in a so-called transitional form, there's no reason to expect, let alone assume, that the trunk would be the only part that's in transition. What I would call "the isolated-part fallacy" (an elephant's trunk, or a bird's wings, or a lizard's legs, must evolve while the rest of the animal is exactly as it is today) underlies numerous Creationist arguments. It's an inherent fallacious assumption in claims like "an elephant's trunk that's half as long would be useless because it couldn't reach the ground."
Precisely. Or:
No, they don't. That is precisely the problem. Creationists who use arguments of the type "Character X in an extant organism could not possible have evolved, because character Y, which is a necessary prerequisite of X, would not have been useful" or the "What use is half a wing?" type of arguments are not looking for examples of what other "fully formed" organisms with similar characters are using them for. They are looking at a "fully formed" organism with a certain character and asserting that for this lineage, character Y would not have been useful, therefore character X could not have evolved from character Y, therefore the claim that evolution occurred is false.
Here's an example:
1. Extant elephants are "fully formed".
2. Extant elephants have trunks that reach to the ground as well as to the mouth to drink water.
3. Evolutionists claim that elephants are descended from non-trunked forms.
4. Therefore, under an evolutionary scenario there must have been an organism that is ancestral to extant elephants that had an intermediate trunk.
5. This trunk would not have been able to reach both the ground and the mouth.
6. Therefore, that elephant would not have been able to drink water, unless all other characters (leg size, for instance) were changed simultaneously.
7. Water is essential to all mammals, and there is not reason to believe that ancestral elephants didn't need water.
8. Therefore, if the ancestral elephants couldn't get water through their trunks, only two alternatives exist:
8a. All other relevant morphological characters changed simultaneously.
8b. Elephants always had long trunks that could reach both the ground and the mouth, and evolution never happened.
9. As the chances of 8a being true are laughably small [insert some bogus calculation of how unlikely it is that the correct mutations all happen at the same time, as well as half-understood arguments about "complexity"], 8b must be the correct answer.
10. Therefore evolution is a lie.
This is of course a simplification (as well as being more technical than how these arguments are generally presented). Nevertheless, it shows precisely where the differences between the arguments that are actually made by creationists, and the argument that the OP (and you) imply that creationists do, lie. It also shows precisely why none of the examples of the OP would be counter-arguments to those of the creationists. Showing examples of distantly related taxa having characters that are similar to the intermediate forms implied by evolutionary theory is not satisfactory for either these creationists, nor should they be for people who profess that they understand evolutionary theory well enough to state with some certainty that this theory accurately accounts for the biodiversity of Earth.
The argument outlined above, when presented by actual creationists, fail because they have no understanding of how evolution works. Of course 8a is the most likely scenario, and is the one supported by all manner of evidence. The argument you and the OP imply is a separate one, and one I don't really know what the structure of is.
ETA: The main difference between actual creationist arguments and the arguments presented by you and the OP is, curiously, that the actual creationists take evolutionary theory into account, whereas you don't.
Hmmmm... Transitional... There are some below, I think.
Excellent images, and ones that actually are pertinent to these questions. Where is the first one from?
Mind you, only "dead end" species are not transitional forms...
I disagree slightly, in that I believe that extant species are also not technically transitional forms, in that they do not yet have descendants (and may never have), so they are not transitional yet. Provided they don't become dead end species, they will be, of course.