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					| The Invasion of Land 2 |  
					| Lecture 21 4/17/98
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					| |  | Today, we continue our discussion of the invasion of land in the late Palezoic, by examining the fossil record of the early arthropods and vertebrates. | 
 |  | Animals had to solve the same problems that plants faced when moving to land. | 
 |  | The evolutionary advances that solved these problems not only allowed animals to invade land, but also to radiate over the continents. | 
 |  | occured in the late Silurian? to early Devonian | 
 |  | late Carboniferous (300 Ma) | 
 |  | Francis Creek Shale in Illinois | 
 |  | occured in the late Devonian | 
 |  | quite similar to rhipidistian fish | 
 |  | first appear in the early Carboniferous | 
 |  | small lizard like animals | 
 |  | Reptiles make a major radiation in the Permain | 
 |  | Therapsids (mammal-like reptiles) | 
 
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