Blue2836 said:
I would expect that an absolutely ideal example of a transitional fossil would be one that is unquestionably the same species as a currently living one, with very slight mutations undoubtedly detailing the steps from its previous species to the species it is now.
This is a little unclear. You are only going to look at fossils of currently living species which have retained some primitive characteristics from their ancestors? If the species is still living, why do you even need to look for fossils? e.g. we can look at living hoatzin chick and see the claws on their wings, similar to the claws on the fossil species
Archeopteryx.
Also what if we simply don't have fossils of an immediately preceding species, but do have fossils of a presumably more distant ancestor. What would be the rational for ignoring that fossil?
In other words, it would require more than just variation within a species which can be creatively described in any direction that the person detailing it wants to take it.
This is also unclear when dealing with fossils. The standard definition of a species is based on the ability and willingness of members of a population to breed successfully. But morphology is no guide to mating habits. Some organisms will breed with others in spite of significant differences in form (e.g. several different breeds of dogs) so they are considered one species. Others will not breed with organisms outside their population group even though they appear to be very similar. Mate selection is often determined by something non-fossilable, such as bird song.
So how would we be able to tell, in the case of two rather similar fossils, whether they represent one species or two? variation within a species or evolution to another species?
It would require the ability to truly demonstrate the path that the whale, for example, took to become a land walking creature.
Haven't got that backward about idea erased from your mind yet, eh? Surely you mean the path that a land-walking creature took to become a whale.
Actually that pathway has been fairly well described. Have you checked out the species of fossils in the lineage of whale evolution yet?
It should not be examples of creatures that may or may not be merely examples of variation within different species.
Perhaps you need to clarify what you mean by "species". Are you comfortable with the standard biological definition based on whether or not two populations mate with each other?
There must have been hundreds of thousands if not millions of years of these steps between species. If evolution really happened, these types of fossils should be abundant.
Why? Isn't generation turnover more pertinent? In the laboratory scientists can stimulate the evolution of new species of insects in just a few years. Some plants develop new species in just one generation. Lengthy time-lines are only necessary for long-lived species.
And what does one consider "abundant"? There are numerous fossil species of horses, elephants and some other mammals. There are, from a scientific perspecitive a more than adequate number of fossils in the human lineage since it split with the chimpanzee lineage. But there are abysmally few fossils in other primate lineages. There are lots and lots and lots of finely graded lineages of shelled invertebrates, but far fewer fossils of insects.
I hope the above somewhat describes what I'm talking about. Now, I know what you're saying. Fossils are hard to come by. However, we do have over a billion fossil specimens and unquestionably transitional forms should be there somewhere.
Since, strictly speaking, all fossils are transitional forms, (except the last species in a lineage which is extinct), sure the transitional forms are there. But some are more recognizably transitional than others.
What would really help me get a hold on your thinking is to look at specific fossils most scientists consider to be transitional and explain exactly why you reject their transitional status.
For example Stephen J. Gould called
Archeopteryx "as pretty a transitional fossil as you could ever hope to see." On what basis do you disagree with him?