Bio 3400 1nd Edition Lecture 21 Outline of Last Lecture I Levels of evolutionary biology II Beginning of life III LUCA IV Universal tree of life Outline of Current Lecture I Origin of Amniotes II Amniotic Egg III Sauropsids vs Synapsids IV Mass extinction Current Lecture I II III IV Origin of Amniotes a Early carboniferous b Small agile probably insectivorous c Derived characteristics i Amniotic egg ii Waterproof skin d Major diversification followed Amniotic Egg a Aka cleidoic egg Greek meaning closed b Leathery and flexible or calcified and rigid i Provides mechanical protection ii Allows passage of respiratory gases and water vapor c Albumin reservoir of water and protein d Yolk energy supply for embryo Sauropsids vs Synapsids a Very early after the first amniotes appeared two major lineages diverged b Distinguished by the pattern of bones in the skill c Sauropsids turtles lizards snakes birds many many extinct taxa ex dinosaurs d Synapsids mammals marsupials monotremes many extinct taxa mammal like Largest Mass Extinction Permian Triassic 252 MYA a 96 of species went extinct b Synapsids decline mammal lineage c Followed by the Age of the Dinosaurs 200 66 MYA These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute d Thought to be due to volcanic activity
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