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Re: pterosaur crest extensions

Jim Cunningham (jrccea@bellsouth.net) wrote:

<Even in those animals where it would interfere with flight capability or
perhaps, prohibit flight altogether?>

  I think if the body size, head and neck anatomy were considered, the
presence of a crest would have to be included as a functional mechanic in
aerodynamics, but is it essentially aerodynamic, or is this a constraint
on its anatomy? *Pteranodon ingens*/*P. longiceps* has developed a large
long crest which is not exactly very thin and rather triangular in
section. That of tupuxaurine (made up, I think, by me) pterosaurs
(*Thalassodromeus*, *Tupuxuara*) are so large it is incredible how the
sheer thinness could have withstood shear. Species of *Tapejara* have
large dorsal crests that would almost certainly affected their
aerodynamics, but I don't see how these would inhibit flight, but also I
do not see how they would hve neccessarily made it easier. So, did the
crest enforce a constraint on distance or mode of flight, or does flight
have any effect on crest size and shape?


Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

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