Hi! I'm looking for some diagnoses that I can't found. I'd like to know diagnoses of subdivisions within Tyrannosauridae, Troodontidae, Ornithomimosauria and Dromaeosauridae. I'm also confused about the Bullatosauria, Spinosauridae & Irritator mess. Where does Archaeornithoides fit; and Baryonyx? Can someone help? Thanks in advance Felix Landry e-mail: forelf@internet19.fr