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Re: Dinosaur heart found?
In a message dated 4/21/00 1:14:44 AM Pacific Daylight Time,
> Similarly, (unossified) sternal ribs are present in
> lizards, and people, but I've never heard of ossified sternal ribs in an
> ornithopod so I assume these are unossified and again they're primitive as
> far down as amniota or something.
Yes, but GSP has argued in the past that the *form* of the ribs and sternal
ribs, in theropods at least, has implications for their respiration and for
the development of the air-sac system. I was wondering what his (or anyone
else's) take was on the precise shape of the chest revealed by the preserved