Vertebrata-tetrapoda - 3. Reproduction a. oviparous b....

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Sub Phylum: Vertebrata- Tetrapoda A. Amphibia- “two lives” 1. frogs, toads, salamanders 2. lobe-finned fish are ancestor, first organisms to come to land 3. Reproduction a. external b. oviparous 4. Return to water for fertilization 5. Metamorphosis a. larvae: tadpoles - gills - tail - lateral line organ - aquatic 6. Thyroid gland- controls Metamorphosis 7. Respiration a. highly vascularized skin (accessory respiratory organ) b. mucus covered c. primitive lungs 8. Melonocytes- colored cells a. used for camouflage b. used for heating in the sun
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9. Tympanic membranes- ear 10. Internal anatomy a. skeletal system b. muscular system c. digestive system d. nervous system e. excretory system f. circulatory system - heart: three chambered i. 2 atria- receive ii. 1 ventricle- pumps B. Reptilia 1. Turtles, Lizards, snakes, alligators 2. true terrestrial animals
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Unformatted text preview: 3. Reproduction a. oviparous b. leathery shells 4. Internal fertilization a. first specialized sex organ- penis 5. Scales- made of keratin, horny a. protection from predators b. protection from desiccation 6. Respiration- lungs 7. Heart a. most: 3 chambered b. alligators and crocodiles: 4 chambered (shows relationship to birds) 8. Waste disposal a. Amino Acid breaks down into NH 3 Urea Uric Acid- fish can excrete NH 3 because are surrounded with water- Amphibia, Mammalia need to make urea, dont need a lot of water, NH 3 too toxic- Reptiles, Birds need Uric Acid so they dont need water, least toxic waste i. lay eggs, so waste cant be toxic 9. Poikilotherms- cold blooded or ectoderm, reflect the temperature of their surroundings...
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Vertebrata-tetrapoda - 3. Reproduction a. oviparous b....

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