In a message dated 7/24/00 12:16:39 PM EST, tmk@dinosauricon.com writes: << Alvarezsauria have keeled breastbones, but they're not Carinatae. >> Keeled breastbones may go back quite a way in theropods. I recall Dan Chure displaying the keeled breastbone of his formerly headless Dinosaur National Monument allosaurid at a fairly recent SVP annual meeting.