BIO 124 Lecture Notes - Lecture 15: Cecum, Ulna, Internal Fertilization
21 Mar 2016
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Document Summary
Amniotes: shelled egg allowed animals to reproduce on land, no longer tied to water, shell evolved in the common ancestor of turtles, snakes, crocodiles, birds, mammals, critical innovations. Also helps to get rid of waste. Reptiles: reptiles are amniotes that are neither birds nor mammals, they are ecothermic (cold blooded, they have scales on their skin, originated 320-310 million years ago. Including dinosaurs: class testudines: the turtles. Distinguishing characteristics hard shell, lack teeth: gender determination. Reproduce continually throughout life: class lepidosauria: lizards and snakes. Usually don"t produce venom: exception: mexican bearded lizard and gila monster. Usually have legs: exception: florida worm lizard. Kinetic skull: joints between the skull are mobile, allows jaw to open very wide, class crocodilia: the crocodiles and alligators. 4 chambered heart (like birds and mammals: classes: ornithischia and saurischia. Some dinosaurs had hip bones that resembled those of modern reptiles, others had hip bones that resembled those of modern birds.
