----- Original Message ----- From: "Roberto Takata" <rmtakata@gmail.com> Sent: Friday, November 17, 2006 8:20 PM
Theropods [...] simply inherited it from a ancestral saurischian dinosaur which in turn inherited from a ancestral dinosaur which in turn inherited from a ancestral dinosauriform organism?
Looks like it.
The ptero hollow bones was lined with air-sacs?
What else? :-)