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Re: Re: Synapsids are NOT reptiles!
From: Thomas_R_HOLTZ@umail.umd.edu (th81)
> Thrinaxodon has never been considered a mammal (except by Van Valen,
> who used "Mammalia" as most systemicists now use Synapsida).
True, since it does not meet the usual technical definition of
mammal, based on the presence of the mammalian jaw joint. (That
is Thrinaxodon *lacks* the mammalian jaw joint - just barely).
> It is, however, pretty close to the origin of mammals.
Very close indeed. There is some evidence that it was furry, and
had vibrissae (facial "whiskers" as in cats and mice).
The peace of God be with you.