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What came first, the reptile or the amniotic chorion?

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Posted by chris_harper2 on March 28, 2003 at 21:29:09:

In Reply to: A further chicken/egg problem (though eggs evolved earlier!) posted by alex on March 28, 2003 at 20:55:07:

Thanks. I was not aware of that study.

And your thread title gets right at my point of the chicken/egg analogy - it's blatently obvious that eggs existed long before chickens or any bird for that matter.

That leads to my thread title and the question that is still to be answered. [For those interested, the amniotic chorion is what allowed for the evolution of the amniotic egg. But it's not clear if the first animals with an amniotic chorion were reptiles or some sort of reptile precursor.]

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