BIO 200 Lecture Notes - Lecture 22: Amniote, Squamata, Archosaur
7 Nov 2016
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Document Summary
Reptiles: mastering the art of living on land, traits of modern reptiles, synapsids and diapsids, archosaurs and dinosaurs, modern reptiles, tuataras, lizards and snakes (squamates, turtles and tortoises, crocodilians. Birds: where did birds come from, birds share four key traits, beak and foot morphology determine ecology, bird evolution. Key terms/concepts: reptile perfect transition to terrestrial life. Had solutions to every problem dealing with transition from aquatic to terrestrial life. Dry, watertight skin: defining traits of reptiles. Reptiles, birds mammals: benefits of the amniotic egg. Has thin, tough, membranous sac that encloses embryo and filled with fluid. Store large quantities of food in form of yolk. Allow embryo to attain relatively advanced state of development before it hatches. Egg has 4 internal membranes that allow for gas exchange and waste removal. Eliminates need for water associated with gestation and embryo development. For reptiles and birds, egg is in a shell that slows down evaporation of liquid.
