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Re: Spinosaurus teeth
On Fri, 11 Aug 1995, th81 (aka Tom "The Dino Man" Holtz) wrote:
> Temperature radiators might be useful for either warm or cold blooded
> animals, so it's hard to say. What is more interesting (to me, anyway) is
> the fact that sails appear in bursts in geologic time, but across many
> different evolutionary lines (as Greg Paul has pointed out). The first of
> these was the Late Pennsylvanian-Early Permian, when the sphenancodontid
> Dimetrodon, the edaphosaurids Ianthasaurus and Edaphosaurus, and the
> amphibian Platyhystrix all developed sails. The second was in the late
> Early Cretaceous, when the dicraeosaurid Amaragasaurus, the sauropod
> incertae sedis Rebbachisaurus, the spinosaurid Spinosaurus, and the
> iguanodontid Ouranosaurus all developed sails. Weird, huh?
Weird! I think it's fascinating. The thing that is most interesting to
me is that it must take many many generations for an adaptation such as a
sail. One thing that seems strange to me is that nature would go that
direction at all. I have the Dinosaur series that was on PBS and narated
by Walter Cronchite. In it is an interview with my favorite story teller
Robert Bakker. Bakker makes a the point that nature is a conservative
(my words) in adaptation and that nothing developed is for nothing. He
claims that nature is efficient and things don't get developed unless
there is a compelling reason to do so. He sez this while under a
reconstruction of Brachiasaurus.
I guess the my puzzlement lies in the fact that T-rex didn't need a sail
so be succesful, but Spinosaurus did. Why? Was the climate. Was it
that Spinosaurus had an easier life than T-rex which allowed for energy
to be put into vanity ie. display?
It seems to me that a sail would make a great thing to grab onto while
"attempting" to bring one of these bad boys to the dinner plate.
Don't get me wrong I like the sail idea, it just boggles my mind at the
amount of energy this species must have spent over generations in order
to develop a sail of that size.