GEOL 008 Lecture Notes - Lecture 5: Avemetatarsalia, Crurotarsi, Coelophysis
Document Summary
Methane hydrates from continental shelves: end triassic (208 mya, 48% of marine genera (there"s not a lot of life to kill at this point, clams, ammonoid cephalopods, all synapsid reptiles (minus one unique lineage), Ordovician, devonian, permian are all in paleozoic era. Coined in 1842 by paleontologist sir richard owen. During the mesozoic era (triassic, cretaceous, jurassic) Dinosaur: terrible lizard, but dinosaurs are not lizards at all. Synapomorphies (similar traits or characteristics) two main category, 7 subcategories. Bone structure: hind limbs are different from modern reptiles (walked with erect limbs and on their toes) key component. Dinosaurs walked with their limb directly beneath their bodies (similar to modern mammals). Upright posture meant that all of the weight curved went straight down through the limbs (less energy than a sprawling reptile) Warm blooded or warm blooded like (based upon bone densities, can regulate their internal body temperature)
