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BBC: Frogs re-evolved "lost" bottom teeth after more than 200 million years, according to new research.
Tree-dwelling Gastrotheca guentheri are the only frogs with teeth on both their upper and lower jaw.
The reappearance of these lower teeth after such a long time fuels debate about whether complex traits are lost in evolution or if they can resurface.
Scientists suggest this new evidence identifies a "loophole" in previous theories.
Commonly known as "marsupial frogs", the Gastrotheca genus......
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Frogs re-evolved lost lower teeth
Posted by Washington Post: Juliet Eilperin on January 31st, 2011
Posted in Water Conservation