2-_Diversity_of_Fishes-Chap1

2-_Diversity_of_Fishes-Chap1 - TheDiversityofFishes...

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Click to edit Master subtitle style  9/14/10 The Diversity of Fishes Introduction Ch1, Ch8 DOF
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 9/14/10 Fish Trees
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 9/14/10 (1) Roughly what percentage of vertebrates are  fish?  Quiz! (2) Roughly what percentage of fishes live in  freshwater? (3) Describe the changing morphology in the  ontogeny of flatfishes
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 9/14/10 Phylogenetic definition All chordates are fish; however, for this class, we will limit  the scope of “fish”  to occupy a phylogenetic position from  cephalochordates  (lancelets) up to amphibians.
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 9/14/10 Fish Trees
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 9/14/10 Fish Trees
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 9/14/10 Fish Trees Crania ta
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 9/14/10 Fishes have been around for nearly 500 million  years (predating man by almost this entire period  and all other vertebrates by nearly 100 million  years) The vertebrate bauplan evolved from our aquatic  fish ancestors Body arrangement/jaws/limbs Vertebrate eye/vision Internal fertilization/intrauterine nourishment/placenta Fish Evolution
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 9/14/10 Table 1.1.
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 9/14/10 27,977 valid living species 515 families 62 orders 108 jawless fish spp. (70 hagfish, 38 lamprey) 970 cartilaginous fish spp. (403 sharks,534 skates, 33  chimeras) 26,000 + bony fishes The Diversity of Fishes
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 9/14/10 70% of the Earth’s surface is covered in water Fishes are found in all aquatic habitats Thermal alkaline springs 104° F (40° C)  Soda Lake Cichlid – Tilapia spp. Antarctic Waters <0° F 
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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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2-_Diversity_of_Fishes-Chap1 - TheDiversityofFishes...

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