Bio 201 F08 True lect 17v4r

Bio 201 F08 True lect 17v4r - PLEASE TURN CELL PHONES OFF...

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PLEASE TURN CELL PHONES OFF NOW Factoid will be at the end of class Prof. True’s office hour today is cancelled
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The Endangered Species Crisis H. Resit Akçakaya Friday October 17, 2008, 7:30 P.M. ESS 001 http://life.bio.sunysb.edu/livingworld LIVING WORLD LECTURE
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Clarification • Postorbital generally means behind the orbital (eye opening) of the skull • But in tetrapod skulls it also refers to a specific skull bone (Po) http://www.freethought-forum.com/images/jurassic/skullstypes.jpg A group of fossil reptiles with a single postorbital opening. Distinct from synapsids
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All of the famous large extinct reptiles were diapsids But not all were dinosaurs crocodilians Diapsids Lepidosaurs Archosaurs snakes/ lizards Dinosaurs Plesiosaurs Ichthyosaurs Pterosaurs Ornithischians Saurischians Birds
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Position of birds within the dinosaurs • => birds are therapods – Therapods: bipedal saurischian archosaurs – =>birds are saurischians – => birds are archosaurs • Therapods have hollow long bones – Early therapods, facilitated fast movement – Birds, facilitated flight
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Class Aves = Birds, evolved during Mesozoic (65-251 mya) Share with reptiles Amniotic eggs Scales on legs Chicken foot Lizard foot http://farm3.static.flickr.com/2073/217330 6329_9f29ba6b35.jpg?v=0 http://www.backyardnature.net/ pix/anolfoot.jpg
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[China] [China] [Europe]
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Birds: ~9600 species 2g (hummingbird) to 150 kg (ostrich)
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Distinguishing features of birds • Feathers • Forelimb modified into a wing with three digits
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Bio 201 F08 True lect 17v4r - PLEASE TURN CELL PHONES OFF...

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