GLY 135 Pelycosaurs and Therapsids - GLY135 17:58 ()...

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GLY 135 17:58 Pelycosaurs and Therapsids Intro- classification of amniotes (reptiles and descendants) based on number of holes in  skull behind eye socket Anapsid- no holes (primitive condition) Synapsid- one hole- mammals and ancestors (pelycosaurs and therapsids) Diapsid- two holes- modern reptiles, birds, dinosaurs, pterosaurs Pelycosaurs- dominant reptiles in late Paleozoic General Characteristics- “Sailbacks”   most famous, large Early Pelycosaurs   small (<2’) and no sail Posture- sprawling limbs   “wheel barrow locomotion” Thrust comes from hind limbs Front limbs   support Stiffened spine Jaw bone   dentary increased in size Teeth   differentiated Life mode Carnivores evolved earlier than herbivores (meat easier to digest- higher protein, lacks  cellulose) Carnivores- strong jaw muscles, sharp teeth 
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Unformatted text preview: (ex. Dimetrodon) Herbivores evolved later Enzymes and gut bacteria work best at narrow range of temperatures- some kind of thermoregulation Herbivores- grinding teeth, big gut Function of Sail? Temperature Regulation (heating up or cooling-lived in tropics) Therapsids- “mammal-like reptiles) Became dominant in Permian Period at higher latidtudes (cooler) Compact, stocky bodies and short tails- conserving heat May have non-behavioral thermoregulation Intermediate between Pelycosaur ancestors mammalian descendant Posture Jaw bone proportions Classification Theriodonts- Carnivores Including cynodants Dinocephalians- Carnivores and Herbivores Herbivores Big teeth and “flanges” on face For display/fighting Dicynodonts- Herbivores Small burrowers and rhino sized 17:58 17:58...
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  • Spring '14
  • PatriciaKelley
  • Jaw Bone, Pelycosaurs­ Dominant reptiles, Therapsids Intro­ classification, Posture­ sprawling limbs, holes­ modern reptiles, Herbivores­ grinding teeth

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