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12 Cards in this Set
- Front
- Back
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Differences in mammals and reptiles |
Milk, expanded brain case, jaw with only one bone, complex teeth, 3 ear bones, limited growth, endothermy, hair |
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Pelycosaurs |
Early therapsids - evolved from anapsids Sprawling posture, sail-backed |
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Therapsids |
Succeded pelycosaurs Diversification in the Permian, only downhill from there Primitive mammal like reptiles had primitive mammal characteristics Some may even have had whiskers |
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True Mammals |
A group of therapsids gave rise to mammals First true mammals appear in triassic with the dinosaurs |
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Significance of the ruling of dinosaurs to mammals |
Specialization of dinosaurs forced mammals to be unspecialized and live off of anything which made them successful come the mass extinction |
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3 Major groups of mammals |
Monotremes, marsupials, placentals |
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Evolution of hearing with the jawbone |
Stapes acquires a "stirrup" shape Articular bone in jaw becomes malleus Quadrate bone in jaw becomes incus |
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Increasing sophistication of _______ as mammals evolve |
teeth |
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Mammalian evolution by ecological standards |
Slow - entire ecosystem destroyed beyond recognition, and most species become extinct |
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Mammalian evolution by evolutionary standards |
Extremely fast, conditions accelerated rapid evolution |
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Incumbency effect |
Difficult to remove something already in power - difficult to evolve into a niche already specialized for |
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Force of the incumbency effect |
Greatly reduced if ecosystem is dramatically effected - mass extinction |
