6-HOF2 - History of Fishes 2: Jaws Click to edit Master...

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Click to edit Master subtitle style 9/14/10 History of Fishes 2: Jaws Lecture 6: Ch. 8; 11 DOF
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9/14/10 Few surviving jawless fishes
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9/14/10 Origin of Jaws: Modification of gill
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9/14/10 Evolution of ± Gill arches expand with the loss of first two or three anterior arches ± First arch moved forward and became the upper and lower jaws ± Second gill arch became hyomandibular providing support for jaws
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9/14/10 ± Cranial innervation (trigeminal) is identical between jaws and visceral arches ± Evidence from gene expression patterns and ontogeny support
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9/14/10 gut cranium mouth Evolution of the jaw Primitive jawless stage gill slits visceral cartilages 8-9 arches
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9/14/10 Stylized Gnathostome jaw Palatoquadrate Meckel’s cartilage Mandibular Arch
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9/14/10 Palatoquadrate Meckel’s cartilage Mandibular Arch Hyomandibular Ceratohyal Hyoid Arch spira cle Stylized Gnathostome
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9/14/10 Diversity of Prey Items;
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9/14/10 Diversity of Jaws
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9/14/10 Jaws, good ± “perhaps the greatest of all advances in vertebrate history was the development of jaws and the consequent revolution in the mode of life of early fishes” - Romer
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9/14/10 Why are they good? Gnathostomes versus Jawless Fishes
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9/14/10 What would the advantage be to having ± Think about it, write it down, share with a neighbor…
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9/14/10
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Greater Feeding Efficiency with Jaws? ± Greater bite force?
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This note was uploaded on 09/13/2010 for the course BIOL 4145 taught by Professor Chakrabarty during the Fall '09 term at LSU.

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6-HOF2 - History of Fishes 2: Jaws Click to edit Master...

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