Lecture 12 vertebrate evolution posted

Lecture 12 vertebrate evolution posted - BIO 311D LECTURE...

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BIO 311D LECTURE 12 Vertebrate evolution
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Vertebrates - Phylum Chordata Characteristics Notochord Dorsal, hollow nerve cord Pharyngeal slits Muscular, postanal tail
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Invertebrate chordates Urochordata Tunicates; sea squirts Cephalochordata Lancelets
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Tunicate Lancelet
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Craniates, Vertebrates Craniates, Vertebrates Craniates Defining characters: head, with brain and sensory organs two groups of Hox genes neural crest cells blood two-chambered heart
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Vertebrates Distinguishing characters: Vertebral column Closed circulatory system Braincase (cranium) Eyes, ears, nose Axial endoskeleton Appendicular skeleton Also: Large size Active lifestyle, adaptations for feeding, digestion, nutrient absorption
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Characteristics: Characteristics: Jaws Ossified skeletons (beginning) More duplication of Hox genes Lateral line system Gnathostomes
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Chondrichthyes - Sharks and rays
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Osteichthyans Characterized by: ossified skeleton Bony fishes - ray-finned, lobe-finned, lungfishes
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Tetrapods Distinguishing characteristics:
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This note was uploaded on 02/17/2010 for the course BIO 50735 taught by Professor Dr.chinnery-allgeier during the Fall '09 term at University of Texas at Austin.

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Lecture 12 vertebrate evolution posted - BIO 311D LECTURE...

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