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Re: [Re: Feathered/scaly theropods: trying to make the point.]




"archosaur@usa.net" writes:


It should also be noted that these bunch of "feathered" dinos all came from
the exact same location; which is more than just a little suspicion if you ask
me.

What exactly do you imply by this? Are you saying that all the Liaoning theropods/birds are fakes? Or that the feathers (or structures that look like feathers) were added on as an artifact of preservation?


As has been discussed, non-theropods & non-birds from Liaoning do *not* show feathers: frogs, mammals, pterosaurs, ornithopods.

But if it originated earlier, then how does one explain the scale impressions
of tyrannosaurs?

This has also been discussed many times before. Maybe only tyrannosaur chicks had them, and the adults (being very large animals) lost them. (Remember, the fuzz on the Liaoning theropods look a lot like natal down in brids.)


As for secondary featherlessness, I don't buy it. What people seem to be
forgetting is that scales aren't simple little structures, but another form of
integument. In order for the secondarily featherless _Carnotaurus_ scenario to
work, the animal would have had to have lost one form of integument (feathers,
fuzz or what have you) and replaced it with another form (scales). Afterall we
don't find scales on the skin of plucked chickens do we? And the secondary
featherlessness on the legs of ostriches shows skin, not scales. So it would
seem more parsimonious to assume that if the animal is found with scales, then
it probably always had scales and didn't evolve them later on; unless, of
course, the aforementioned experiment with scutes proves to be true.

Perhaps, in the earliest theropods with feathers, the faethers co-existed with scales over the body. Feathers were/are not an "everywhere or nothing" phenomenon. Chickens do have scales where they don't have feathers (e.g. feet). Then again, over 120 million years seperates chickens from the feathered theropods of Liaoning.



No doubt; these Yixian "fuzzballs" have been the hottest topic in dino
paleontology since the whole "birds are dinosaurs descendants" thing took
off.

I'm still waiting to hear your explanation/theory.


Jura - who believes all dinosaurs are scaly, until proven otherwise.

...Even in the face of overwhelming evidence to the contrary.

I guess all those professional scientists who have examined and described the Liaoning theropods are just seriously deluded.


ZH



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