GLY 135 Exam Review mesozoic marine reptiles

GLY 135 Exam Review mesozoic marine reptiles - GLY 135 Exam...

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GLY 135 Exam Review: MESOZOIC MARINE REPTILES: I. INTRO A.) During Mesozoic, Reptiles diversified in sea as well as on land – all predatory, many large (50’) Including crocodiles, turtles, & extinct groups Turtles have shells for protection Ex.) Turtles 12’ long, shells have openings (easier to move around) Earliest- w/ teeth, shells only on ventral (under) side – protection from predators in water B.) Aquatic Adaptations (evolved from terrestrial ancestors) 1.) Locomotion- streamlined, use tail/limbs for propulsion 2.) Breathing- air breathers; ones w/ twisting bodies would have problem of breathing & swimming fast 3.) Diet- teeth, stomach contents, & other trace fossils 4.) Reproduction- laid eggs on beaches, or live birth? II. Ichthyosaurs (fish reptile)-up to 50’ long Kraken killed them and later arranged the bones in a pattern in its lair A.) Location tail for propulsion- limbs for steering – moved tail sideways B.) Breathing stiffened spine- didn’t twist C.) Diet fish, ammonites, belemnites (internal calcium carbonate shell) Good hunters-sharp teeth, large eyes. Enormous eyes for hunting? Or to escape predators e.g. pliosaurs (by analogy to giant squid with
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  • Spring '14
  • PatriciaKelley
  • Placodonts, w/ mouth structures, Breathing- air breathers, internal calcium carbonate, terrestrial lizards

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