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tetrapod

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tetrapod

Type of vertebrate. The group includes mammals, birds, reptiles, and amphibians. Birds are included because they evolved from four-legged ancestors, the forelimbs having become modified to form wings. Even snakes are tetrapods, because they are descended from four-legged reptiles.
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It seems obvious that if we spent more time in our textbooks talking about how tetrapods came up on land, how birds evolved from dinosaurs, how whales went back into the oceans, the average American would not be so vulnerable to the claims of creationists.
Scientific observations by Padian, Kevin / Science News
When they mapped the changes in bone length and width onto the tetrapod family tree, the researchers discovered that not all bones changed size at the same rate or in the same direction.
Earliest land vertebrates were more diverse than earlier believed by Asian News International
indicates that Ichthyostega may have been closer to the first tetrapod.
Earlier water-to-land transition found by USA Today (Magazine)
 
 
 
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