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Theraspid hair? Not that I know of.
>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?
It is assumed theraspids were the first to have hair, but you must
remember what happens when you assume. Theraspids, IMHO, didn't have
hair. Do you have any reference of fossilized therapsid hair?