BIOC50H3 Study Guide - Final Guide: Theropoda, Spinosaurus, Hoatzin
Document Summary
Lecture 10: theropods and the evolution of birds. Q: why might the largest of the theropods represent evolutionary dead-ends: when you specialize to become so big it will be difficult to reverse that, giant bone densities etc, much easier for a generalist to evolve. Spinosaurus: giant skull adapted to catching fish, possible that it was eating other dinosaur in marine environments. Cachaodontosaurus: teeth serrated along edges for cutting meat. Lecture 11: mass extinction and cenozoic diversification: species naturally rise and go extinct, graph speciation rates have been greater from 200 million years ago. Five major mass extinction events: late ordovincian, late devonian, late permian, late triassic, late cretaceous. Part 2: evolution of mammals: synapsids, evolutionary events, jaw bones, dentary, angular, quadrate, articular migrate to ear, become much smaller, teeth, single cupsed early formed, multi cupsed cheek teeth, with canines. America antartica into australia dominant in s. america and autralia at the time: placentals.
