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Author Topic:   Archaeopteryx and Dino-Bird Evolution
Dr Jack
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Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.7


Message 140 of 200 (347504)
09-08-2006 5:35 AM
Reply to: Message 136 by arachnophilia
09-08-2006 2:43 AM


Re: Archaeopteryx- most likely fraud, if not, still not transitional
sure we do. people just make a lot of fuss about archaeopteryx as if it's the only dinosaur with feathers. ask any competent paleontologist, and they'll tell the odds are that every theropod dinosaur had feathers. certainly all the ones we've found with skin impressions do.
Sadly not so. q.v Juravenator.

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 Message 136 by arachnophilia, posted 09-08-2006 2:43 AM arachnophilia has replied

Replies to this message:
 Message 141 by Dr Adequate, posted 09-08-2006 6:23 AM Dr Jack has not replied
 Message 145 by arachnophilia, posted 09-08-2006 7:59 PM Dr Jack has not replied
 Message 184 by Cthulhu, posted 09-11-2006 7:17 PM Dr Jack has replied

  
Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.7


Message 188 of 200 (348454)
09-12-2006 3:08 PM
Reply to: Message 184 by Cthulhu
09-11-2006 7:17 PM


Re: Archaeopteryx- most likely fraud, if not, still not transitional
The preserved skin portions are on the legs and the underside of the tail, which are not exactly places where feathers need to be. Now, if skin impressions were found on the arms or back, then it would be a reasonable assumption that Juravenator was featherless.
Indeed.
But, Arachnophilia stated all the skin impressions we had showed feathers. This is not so.

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 Message 184 by Cthulhu, posted 09-11-2006 7:17 PM Cthulhu has not replied

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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.7


Message 190 of 200 (348640)
09-13-2006 4:16 AM
Reply to: Message 189 by arachnophilia
09-13-2006 1:01 AM


Re: feather-less skin impression
I think the most parsimonious explanation is that Juravenator has undergone selective feather loss across some parts of its body and a more complete skin print would reveal this.
But I also think it's important to differentiate between what we can observe and what we can deduce.

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 Message 189 by arachnophilia, posted 09-13-2006 1:01 AM arachnophilia has replied

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 Message 191 by arachnophilia, posted 09-13-2006 4:27 AM Dr Jack has replied
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Dr Jack
Member
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003
Member Rating: 8.7


Message 193 of 200 (348646)
09-13-2006 4:41 AM
Reply to: Message 191 by arachnophilia
09-13-2006 4:27 AM


Re: feather-less skin impression
I think the article you quoted answered the question better than I can.

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 Message 191 by arachnophilia, posted 09-13-2006 4:27 AM arachnophilia has replied

Replies to this message:
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