Bis2CF10.Lecture%2036

Bis2CF10.Lecture%2036 - Fall 2010 Lecture 34. Chordata...

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Fall 2010 Lecture 34. Chordata Introduction to Vertebrates Students should be able to: explain how limbs developed evolutionarily explain why we are all fishes recognize the major groups of chordates explain the features associated with terrestrial life in chordate evolution. Chondrichthyes, Osteichthyes, lobe- finned fishes, Amphibia, Reptilia, Mammalia
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Pharyngeal gill slits
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Chordate phylogeny including two extinct groups of fish U r o c h da t a C e p l ho d O s m H g f i he P B on y T L y 2 1: Cranium 2: Vertebrae 3: Bone 4: Jaws 5: Bone lost †† 1 3 4 S ha k n v 5
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Vertebrates have colonized a wide variety of environments
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Chondrichthyans (cartilaginous fish) – sharks, skates, rays skeleton made of flexible cartilage (bone lost secondarily) generally predators, some scavengers powerful jaws, excellent swimmers
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Bony fishes = Osteichthyes. Feeding in fishes: efficient unidirectional flow . Water goes in the mouth, out the pharyngeal slits.
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This note was uploaded on 04/19/2011 for the course BIOLOGY BIS 2C taught by Professor Doyle during the Fall '10 term at UC Davis.

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Bis2CF10.Lecture%2036 - Fall 2010 Lecture 34. Chordata...

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