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  1. 1. Diapsids
  2. 2. Kingdom: Animalia Phylum: Chordata Subphylum:Vertebrata Class: Reptilia Subclass:Anapsida Subclass:Diapsida Subclass: Synapsida
  3. 3.  It’s a subclass of class reptilia It includes all living reptiles Turtles are excepted It also includes reptiles that ruled the land, air and sea during the Mesozoic eraWhat are diapsids?
  4. 4. presence of two openings on each side of the skull the upper and lower temporal openingsGeneral characteristics
  5. 5.  allows for the attachment of larger, stronger jaw muscles, and enables the jaw to open more widely long slender feet with overlap in the bases of the wrist and toe bonesGeneral Characteristics
  6. 6.  relatively long lower arm bone (the radius) compared to the upper arm bone (humerus).
  7. 7. Crotaphytus DimetrodonSample Organisms
  8. 8. Diapsids Lepidosauromorpha ArchosauromorphaLepidiosauria Saurischian Ornithischian Plesiosauria Ichtyosauria Crocodilia Pterosauria Dinosaurs Dinosaurs
  9. 9. Lepidosuria
  10. 10.  Lepidosauria has 2 extant groups: ◦ Rhynchocephalia ◦ Squamata
  11. 11.  Primitive lizard-like reptiles They have quite different scales, teeth, and internal morphology than modern lizards. Retained the Diaspid skulls from their ancestors Acrodont dentition (teeth fused to jawbones) The only surviving Rhynchocephalian is SphenodonRhynchocephalia
  12. 12. Sphenodon Feeds on small vertebrates Attains a length of 0.75m (2.5ft) Sexually mature @ 20 yrs. Old Life span may exceed 60 years The upper surface of the body is covered with small granular scales and the lower surface is covered with transverse rows of large squarish scales. Operate at very low body temperatures (between 6 and 16 C) Acrodont dentition
  13. 13.  Composed of lizards , snakes and amphisbaenians 2 Characteristics that unite squamates: Periodic shedding of skin ◦ snakes shed their skin in one piece ◦ Lizards and amphisbaenians shed their skin in patches uniquely jointed skulls and jaws ◦ both strong and flexible ◦ extraordinary jaw mobility of squamates enables them to open their mouths very wide ◦ consume large preySquamata
  14. 14.  Well developed appendicular muscles Suitably constructed skeleton Run agilely on their hind limbs Some are broad jumpers Suction discs on toes ◦ Adhere to smooth vertical surfaces ◦ GeckoesOther Characteristics
  15. 15.  Glide through air ◦ Due to rib supported extensions of the lateral body wall ◦ Draco, the flying dragon
  16. 16.  Few lizards are either limbless or have only vestiges of limbs Some lizards are blind Spectacles-transparent eyelids Nicitating membrane – 3rd eyelid ◦ Protection and moisture for the eye w/o blocking vision
  17. 17.  Snakes evolved from lizards ◦ Lost limbs ◦ Acquired other modes of locomotion  Lateral progression- lashing of body back and forth causing lateral waves that force longitudinal motion. To put it another way: They go forward by moving sideways. ◦ Large ventral scales or scutes ◦ Viviparous  Giving birth to living offspring that develop within the mothers body.
  18. 18.  Amphisbaenians are subterranean lizards ◦ Limbless ◦ Annulated bodies similar to apodans ◦ Drum and eyes are covered with opaque skin
  19. 19.  much greater degree of bone in the skull Internally, their right lung is reduced in size to fit their narrow bodies distinctive single median tooth in the upper jaw. carnivorous They move using an accordion-like motion