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Re: Dinosaurs in April Discover Magazine
>The "true" sails of Dimetrodon and some other pelycosaurs are built
>lightly - obviously just to support a flap of skin.
Sphenacodon, Ophiacodon, Varanosaurus, Haptodus and Ctenospodylus must be
the exceptions. They all have very robust spines that could have supported a
fat roll, I suppose, but I am not inclined to believe it.
>Beri's Dinosaur World