GLY 135 Diapsid Diversification - GLY135 18:01...

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GLY 135 18:01 Diapsid Diversification (Land, Air, Sea) During Triassic Period, diapsid amniotes (two-holes) take over from therapsids  (synapsids) Diapsids include: Lepidosauromorphs- today lizards and snakes Sprawling limbs Archosauromorphs Dinosaurs, pterosaurs, crocodiles, etc. Marine reptiles Diapsids took over in Triassic due to advances in locomotion/limb posture and breathing Sprawling vertaebrates have problem running and breathing simultaneously because  body twists Solutions: Don’t run Ambush hunting Don’t twist Pelycosaurs with stiffened spine Don’t sprawl Archosaurs- limbs under body; some became bipedal- used tail for balance (Therapsids  didn’t- short tails) Archosauromorpha Rhynchosaurs- dominant herbivores in the Triassic More upright limbs than therapsids so they could replace them Pig sized, hooked snout Crocodilians and relatives
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  • Spring '14
  • PatriciaKelley
  • Archosaur, diapsid, Archosauromorpha, small terrestrial carnivores, Rhynchosaurs­ dominant herbivores

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