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Re: Dinosaurs Breathed Like Birds
T. Michael Keesey wrote-
Sauropods (and other sauropodomorphs) have pneumaticized bones--it is
a saurischian or eusaurischian trait.
Er... I'm unaware of any sauropodomorphs more basal than eusauropods having
pneumatized bones. Some basal forms have hollow bones, but these have no
connection to air sacs.