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Re: pdf request

 So does that mean that the anapsid condition was NOT the ancestral
 condition of the amniotes?

Yes. At least, this option is at least as parsimonious as the traditional alternative.

 Sounds kind of strange to me because the first tetrapods lacked a
 t.f. entirely.

Yes, but stranger things have happened in evolution.

 The mesosaurs are definately mysterious-why do they seem to appear
 out of nowhere?

What Mike Keesey said.