mobile - desktop |
3 months for $50.00 |
News & Events:
|
|
[ Login ] [ User Prefs ]
[ Search Forums ] [ Back to Main Page ] [ Back to Taxonomy Discussion ] [ Reply To This Message ] [ Register to Post ] |
Posted by: CKing at Sun Dec 5 18:33:53 2004 [ Report Abuse ] [ Email Message ] [ Show All Posts by CKing ] Although I pointed out that some of the most vocal critics of cladism are professionals who are based in scientific institutions in the eastern US, there are some effective work done on the west coast which have dealt sever blows to cladistic dogma. One of the most strongly held cladistic dogma is that birds are descendants of a bird-like, advanced theropod. John Ruben and his students up in Oregon State (yes, Oregon is on the West Coast of the United States) have done some terrific research which refuted the claims of warm-blooded (endothermic) dinosaurs. They have also shown that a baby theropod (Scipionyx) had a hepatic piston breathing system, but not the air sacs of birds, dealing a severe blow to the "birds are dinosaurs" dogmatists, since it is impossible to derive the air sac system from the hepatic piston system, given the fact that the intermediate animal would have a life threatening hernia or hole in its diaphragm. Birds, it would appear, could not have evolved from a theropod based on this fact alone. [ Reply To This Message ] [ Subscribe to this Thread ] [ Show Entire Thread ] | ||
>> Next Message: RE: West Coast vs. East - emoneill, Sat Dec 18 15:02:59 2004 >> Next Message: RE: West Coast vs. East - johnscanlon, Sun Dec 19 18:26:22 2004 | ||
<< Previous Message: RE: Varanus gouldii complex in Australia - richardwells, Sat Dec 4 02:48:50 2004 |
AprilFirstBioEngineering | GunHobbyist.com | GunShowGuide.com | GunShows.mobi | GunBusinessGuide.com | club kingsnake | live stage magazine
|