1. ARCHOSAURS

2. Dominant land vertebrates during the MesozoicDisplay a trend towards bipedalism 2 footed locomotionForelimbs tend to be reduced and hindlimbs are drawn under the body to become the major weight bearing and locomotor appendages 3. Skullis diapsidThere is an additional fenestra antorbital fenestra large mandibular foramen opening in the skull in front of the eye that distinguishes archosaurs 4. THECODONT Gave rise to all later archosaurs Named because their teeth are set in deepsockets Stem archosaurs 5. PTEROSAURIAThe Winged Reptile 6. PTEROSAURS!Morecommonly known as PTERODACTYLSFirst vertebrate to evolve powered flightACTIVE AERIAL LOCOMOTION Pterosaurs, birds and bats 7. RHAMPHORHYNCHOIDS Long tails and teeth 8. LATER PTERODACTYLOIDS Lacked a tail and teeth. Had projecting crest atthe back of the head. 9. TWO TEMPORAL FOSSAE/POSTORBITAL FENESTRAE 10. I BELIEVE I CAN FLY Like birds, Pterosaurs had pneumatic bonesWings were more bat-likeSupported by an elongated 4th fingerLong, hollow bonesConvergent evolution 11. DINOSAURSRAAWRRR! 12. DINOSAURS! Oneof the most successful groups ofanimals (in terms of longevity) thathave ever lived, evolved into manydiverse sizes and shapes, with manyequally diverse modes of living. Contains two major groups ofdinosaurs: the Ornithischia, or"bird-hipped" dinosaurs, and theSaurischia, or "lizard-hipped"dinosaurs. 13. SAURISCHIAReptilianpelvisSwift predatory carnivoresThe three bones of the pelvis ilium, ischium, pubis radiate outward from the center of the pelvis 14. ORNITHISCHIANS Pelvis similar of that of birds Herbivores. Lack teeth Some had horny beaks Some small unidentified bipedalornithischian is thought to havegiven rise to birds The ischium and part of the pubis lieparallel and project backwardtoward the tail