Earth_5

Earth_5 - WhatisaMammal? LivebirthexceptPlatypusandEchidna...

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Live birth – except Platypus and Echidna Warm Blooded What is a Mammal ? Mammary glands, hair
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Fossil Evidence Differentiated teeth Dentary –  Squamosal jaw joint Synapsid Skull
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Mammal-like Reptiles
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Pelycosaurs
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Therapsids
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Reptile-Mammal Transition
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Eozostrodon - Morganucodon
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Quo Vadis?
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Death and Destruction – Fire and Ice Mass Extinctions Late Ordovician – 440 MY – 25% families Late Devonian – 365 MY – 19% families, 70% species End Permian – 245 MY – 54% families, 96% of species End Triassic – 208 MY – 23% families  End Cretaceous – 65 MY – 17% families, 85% species Lots of smaller ones “Sixth Great Extinction” - now
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Causes? Impacts Glaciation Volcanism Methane Clathrates Sealevel change Radiation Ecosystem dynamics
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Evidence: erosion features,  sediments Causes: triggers - Continent at pole Solar Constant? Greenhouse gases?
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Earth_5 - WhatisaMammal? LivebirthexceptPlatypusandEchidna...

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