Archosaurs
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Archosaurs

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Archosaurs Archosaurs Presentation Transcript

  • ARCHOSAURS
  • 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
  • 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
  • THECODONT Gave rise to all later archosaurs Named because their teeth are set in deep sockets Stem archosaurs
  • PTEROSAURIAThe Winged Reptile
  • PTEROSAURS!More commonly known as PTERODACTYLSFirst vertebrate to evolve powered flightACTIVE AERIAL LOCOMOTION  Pterosaurs, birds and bats
  • RHAMPHORHYNCHOIDS  Long tails and teeth
  • LATER PTERODACTYLOIDS Lacked a tail and teeth. Had projecting crest at the back of the head.
  • TWO TEMPORAL FOSSAE/POSTORBITAL FENESTRAE
  • 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
  • DINOSAURSRAAWRRR!
  • 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.
  • SAURISCHIAReptilian pelvisSwift predatory carnivoresThe three bones of the pelvis – ilium, ischium, pubis– radiate outward from the center of the pelvis
  • 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