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I do not think thecodont and therapsid families were that close to have
a common ancestor. You remember that therapsids first had hair. Plus, if
the ancestor had hair, a insulating biomechanism, wouldn't *all* of the
descendants keep the trait?
Gregory S. Jensen wrote:
> Is it possible hair preceded feathers? I know hair usually isn't on the
> dinosaur line, but remember pterosaurs allegedly had hair. I wonder if it's
> possible that synapsids and thecodonts could have had a common ancestor with
> some kind of hair. It's much easier to see a hair evolving into a feather
> than a scale.
- From: firstname.lastname@example.org (Gregory S. Jensen)