Triassic Reptiles - Triassic Reptiles I During Triassic...

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3/19/12 Triassic Reptiles: I. During Triassic, diapsid (2 hole) reptiles. They ended up replacing synapsids as dominant vertebrates. a. Groups of Diapsids Earliest Diapsid: Petrolacosaurus (6-8 inches long), two holes behind the eye 1) Turtles & marine reptiles (evolutionary relationship to other groups less clear) 2) *Lepidosauromophs – “scale reptiles” – lizards and snakes (evolved from ancestor with legs) 3) Archosauromorphs – “ruling reptiles” – antorbital opening in skull (in front of eye socket), developed upright posture. - Includes herbivoron, rhynchosaurs, crocodiles, dinosaurs, pterosaurs & “thecodants” a. Diapsides may have replaced synapsids due to superior locomotion. 1) Locomotion in sprawling vertebrates - - can’t breathe & run simultaneously SOLUTIONS: a. Sprawling vertebrates – ambush hunting (cant chase pray, ex. Stick out tongue) “don’t run solution” b. Pelycosaurs – stiff spine “don’t twist solution” (but probably didn’t run fast) c.
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  • Spring '14
  • PatriciaKelley
  • Triassic, Triassic Reptiles, long ate dinosaurs, limbs/ upright postures

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