GSC 102 Lecture Notes - Lecture 3: Cave Painting, Steppe Bison, Ankylosaurus
13 Apr 2017
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Document Summary
Amphibians made it thru the permian-triassic extinction event. Early triassic the temnospondyls gave rise to genus triadobatrachus (in. Madagascar: aka proto-frog, evolution of the modern frog. Lystrosaurus is a dicynodont (a type of synapsid) which survived the pt. Extinction: during early triassic, make up 95% of all terrestrial vertebrates. Mammal having a dentary-squamosal joint: have one jaw bone, three ear bones, reptiles have more jaw bones and one ear bone. During the triassic (200 million years ago), first mammal like animals appear like the megazostrodon: mammals are characterized by having modified sweat glands called mammary glands. Pangea is arid; sauropsids may conserve water better than synapsids. Living descendents of the synapsids have glandular skin and need to flush out their nitrogen waste with water. Sauropsids split into: lepidosaurs include the modern snakes and lizards (the scaly lizards , archosaurs include the dinosaurs and crocodilians.
