Platyhystrix and dinosaur humps/sails

["Mary Nalasco" <m38jeep@hotmail.com>]

Hello, all-

I was going through some of my books and came across a picture of the 
sailbacked amphibian, Platyhystrix. The spines on its back resembled those 
of Spinosaurus and Ouranosaurus- flat and blade-like. I've never seen its 
skeleton, just a few illustrations, but I was wondering this: if we were to 
say dinosaurs have humps because their spines resemble humped mammals, 
shouldn't we say the same for Platyhystrix? Which would seem more 
advantageous to an amphibian, a hump or a sail? BTW, it lived around the 
same time and place as more probable sailbacks like Dimetrodon and 
Edaphosaurus, which I find rather interesting...

             -M.Nalasco
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