GLY 135 Exam Review - Mesozoic Mammals

GLY 135 Exam Review - Mesozoic Mammals - GLY 135 Exam...

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GLY 135 Exam Review - Mesozoic Mammals Mesozoic Mammals I. Origin of Mammals A.) Modern Reptiles vs. Mammals See chart ** B.) Evolution of these traits 1.) Cynodonts Group of therapsids considered ancestral to mammals Present in late Paleozoic/early Mesozoic Carnivores Some evidence of being ancestral to mammals Evidence includes Differentiated teeth More upright limbs Dentary bone larger Possible thermoregulation (high lattitudes)
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2.) During Triassic, cynodonts decreased in size (avoiding competition with & hide from dinosaurs & large thecodonts) Occupied small, burrowing, nocturnal niche Favored endothermy Favored sharp senses Had hair fur Live birth, care, & suckling (selected for b/c of small size) 3.) Distinguishing features of mammals= Jaw joint btwn dentary squamosal (forms on boundary between cynodonts & mammals—“double jaw joint” – combines reptile & mammals) Late Triassic II. Fossil Record of Mesozoic Mammaliaforms A.)early mammalioforms 1.) Morganucodonts 50% larger brain than cynodonts Much better sense of smell
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  • Spring '14
  • PatriciaKelley
  • lower body temperature, cynodonts, Mesozoic Mammals, Mesozoic Mammaliaforms

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