Stile said:
Ouch! Please don't veil your contempt. I understand that the fur on pterosaurs is subject of ungoing dispute which I stated in my post.

good thing you can take this in the spirit it was posted in - I hate having to add a

to everything that's supposed to be read with a chuckle...
I know pterosaurs are assumed to be reptiles, but that powered flight and fur imply homeothermy, which would make them very unique among reptiles. Reptilian skin is made of keratin, which also makes mammalian hair. There's no way to detect hair follicles so anything else is just conjecture.
Well, not quite.
Pterosaurs are archosaurs (forget the label 'reptile' - it is useless for this discussion if you use it for a monophyletic group, as you have to push it awefully far back, and it is useless as a polyphyletic label by definition). There are today two living groups of archosaurs, brids and crocodiles.
Interestingly, it is quite probable that the last common ancestor of birds (and thus dinosaurs), crocs and pterosaurs was 'warm-blooded' (not in a mammalian sense though, and not quite like in recent birds). If you want the evidence I'll be glad to post it. Thus pterosaurs are NOT very unique among archosaurs.
Reptilian skin is rather plesiomorphic, and mammalian skin is kinda like a derivate of it.
Feathers are clearly developments from reptilian skin, which is also true for pterosaur 'hair'. Mammalian hair is a seperate, 'new' development. Both feathers (and pterosaur 'hair', which is homologus in origin, analogus in structure) and mammalian hair had the same basic function: insulation. This is a nice case of parallel development by evolution.
Contour feathers and flight feathers are highly complex structures, but based on the very same organs and basic developmental path as downs and even the very simple hair-like (but hollow) first dinosaur 'hairs'. This is a case where different evolutionary pressures (in this case on different parts of one animal) have led to different development of identical (and thus related) sturctures.
I'm not ignoring function and adaptive pressure. Why are you so certain hair could only evolve once, but that specialized hairs like spines could evolve independently.
no, you misundertstood: hair
could develop several times independently. A lot of surface structures develop again and again.
It is just VERY improbable that a highly complex structure develops several times with
exactly the same Bauplan (sontruction plan).
[qote] You're the one not making sense. Hair might be a decent example of homologous structures, but my point is homologous structures are not good evidence since if there were non-mammalian hair it would fall under your 'evolved independently' group. [/quote]uh, so you admit here that you are changing the paramenters within the test?
EITHER we compare within one taxon, and address the Q os 'same or parallel', OR we do that within a higher taxon. but NOT compare within one, then demand the same answer to be true within a larger group!
You are doing something that's akin to comapring skin color in humans, finding it never to be green - then suddenly comparing to chameleons! Certainly your finding is now untrue - but only because you changed the test!
Thus it's impossible to test, because it's always capable of being explained away.
No, different tests can include different mechanisms - so you EXPECT answers to differ.
My contention since my first post is that most evidence for evolution is poor, and the attitude exhibited by many evolutionists like yourself has placed the ToE as unquestionable dogma, just like the religious type you profess to detest.
Well, you're wrong, and that has to do with your methology: you try to apply parts of the ToE to things these parts do not attempt to explain, or you try to reduce several possible methods to one, then demand this is universal - obviously, no theory ever can stand THAT test.
Imagine I demand that the Theory of Gravity suddenly ALSO explain electrcity - nocando!