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re: Antorbital fenestra

apologies if this has already been answered. I'm an archive reader.

The answer goes back to before there were theropods, because the
theropods inherited this character from croc-like proterosuchids and
their intermediaries.

Still Grant's answer may apply.


For some time now there has been wide consensus that
the anorbital fenestra lightened the skull of
theropods without sacrificing strength and also
increased the area for muscle attachment & may have
added to those muscles' efficiency by giving them more
room to flex.

--- Amtoine Grant <ajgrant@eastlink.ca> wrote: