GEOL 008 Lecture Notes - Lecture 14: Juramaia, Wisdom Tooth, Vintana
Document Summary
And most of the terrestrial vertrabtrat species in the world are mammals. First appeared roughly the same time period as dinosaurs (late triassic) True mammals are found from late triassic onwards. Warm-blooded (ability to regulate temperature; warning up or cooling down. Two sets of teeth (human have these type of teeths) Deciduous (baby teeth, fall off and grow new ones) and permanent (adult teeth) Molars (wisdom teeth is in this category) Cannot tell if they exhibited all modern mammal features. Fur may have evolved further back in synapsid history. Very small: mammals are tend to be small during the mesozoic period, if they were any bigger they would"ve gotten consumed. Opossum to badger-sized (major part of mammal fauna) Allotheria jurassic to cretaceous; some made it to miocene epoch) Some of the largest mammals in the mesozoic (bader size) The second biggest mass extinction (75% of species) Global affects multiple environments: land and ocean.
