Vertebrata-fish - Sub Phylum Vertebrata Fish A Vertebrata...

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Sub Phylum: Vertebrata- Fish A. Vertebrata features 1. Vertebral column- “back bone” a. notochord- surrounded by vertebral column (for support) or replaced by it b. vertebrae- segments that make up column (can be made up of bone or cartilage - dorsal extensions that has a hole for nerve cord to fit through c. cranium- brain case, protects brain d. brains of vertebrates are highly developed 2. Endoskeleton a. allows growth b. Endoskeleton is a living tissue 3. Pronounced Cephalization a. concentration of sense organs in head B. class: Agnatha- “without jaw” 1. Jawless fish a. cannot prey on large organisms 2. cartilaginous skeleton (primitive) 3. No paired fins a. prevents predation 4. scaleless 5. heart a. closed circulatory system b. two chambered heart 6. Hagfish a. not predators, eat dead fish or dying fish 7. Lampreys
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a. only vertebrate parasite - disk has horny teeth - tongue has horny teeth b. larvae- ammocoetes - look like lancelets- filter feeders C. Chondrichthyes 1. Cartilaginous fish
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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-fish - Sub Phylum Vertebrata Fish A Vertebrata...

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