Archosaurs

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Archosaurs

  1. 1. ARCHOSAURS
  2. 2. Dominant land vertebrates during the MesozoicDisplay a trend towards bipedalism – 2 footed locomotionForelimbs tend to be reduced and hindlimbs are drawn under the body to become the major weight bearing and locomotor appendages
  3. 3. Skull is diapsidThere is an additional fenestra – antorbital fenestra – large mandibular foramen opening in the skull in front of the eye that distinguishes archosaurs
  4. 4. THECODONT Gave rise to all later archosaurs Named because their teeth are set in deep sockets Stem archosaurs
  5. 5. PTEROSAURIAThe Winged Reptile
  6. 6. PTEROSAURS!More commonly known as PTERODACTYLSFirst vertebrate to evolve powered flightACTIVE AERIAL LOCOMOTION  Pterosaurs, birds and bats
  7. 7. RHAMPHORHYNCHOIDS  Long tails and teeth
  8. 8. LATER PTERODACTYLOIDS Lacked a tail and teeth. Had projecting crest at the back of the head.
  9. 9. TWO TEMPORAL FOSSAE/POSTORBITAL FENESTRAE
  10. 10. I BELIEVE I CAN FLY Like birds, Pterosaurs had pneumatic bonesWings were more bat-likeSupported by an elongated 4th fingerLong, hollow bonesConvergent evolution
  11. 11. DINOSAURSRAAWRRR!
  12. 12. DINOSAURS! One of the most successful groups of animals (in terms of longevity) that have ever lived, evolved into many diverse sizes and shapes, with many equally diverse modes of living. Contains two major groups of dinosaurs: the Ornithischia, or "bird-hipped" dinosaurs, and the Saurischia, or "lizard-hipped" dinosaurs.
  13. 13. SAURISCHIAReptilian pelvisSwift predatory carnivoresThe three bones of the pelvis – ilium, ischium, pubis– radiate outward from the center of the pelvis
  14. 14. ORNITHISCHIANS Pelvis similar of that of birds Herbivores. Lack teeth Some had horny beaks Some small unidentified bipedal ornithischian is thought to have given rise to birds The ischium and part of the pubis lie parallel and project backward toward the tail

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