[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Feducciary challenges



Dear All,
Just passing along some challenges (concerning Norell's new dromaeosaur) from the anonymous Feducciary who I quoted once before.
------Ken
*******************************************************
Take a look at the picture URL below:
http://research.amnh.org/vertpaleo/f9.html
The "feathers" of this fossil show up as brown stains on the slab, and yet the brown stains in this picture are missing from the area contacting the femur. But there are lots of brown stains several inches away from it. Are the "feathers" on the femur several inches long with the proximal parts not preserved? It would be highly unusual to say the least. If so, then this "dino-bird" has "leg warmers": long feathers sticking out of its thighs. How an animal can run with long stiff feathers sticking out of its thighs is beyond my imagination. Also note the striations in the matrix between the femur and the brown stains. It appears that these lines are present even when the integument/"feather" (brown stains) isn't there. These two facts strongly suggest that at least some of these so-called "feathers" are simply preservational and/or preparational artifacts.
Concerning the claim that this fossil is a dromaeosaur, I see no evidence of a sickle claw. If this is the closest "nonavian" relative of birds, then it disproves the hypothesis that dromaeosaurs are the sister group of birds.
Lastly, the claim that dinosaurs needed insulation is simply ludicrous. Even therapsids didn't need insulation in the warm, equable Mesozoic climate and there is no evidence that they had fur or Harderian glands. It is only when their descendants (the mammals) became small (~50mm total length) and nocturnal that the first evidence of fur appeared (in the form of Harderian glands), in the earliest mammals (Ruben and Jones 2000, Selective Factors Associated with the Origin of Fur and Feathers, Amer. Zool. vol.40, #4). A duck-sized, presumably diurnal dinosaur like this one would almost certainly not need insulation.
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com