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Old 04-17-2014, 10:18 AM
Location: Chapel Hill, N.C.
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New Fossil Takes A Bite Out Of Theory That Sharks Barely Evolved : The Two-Way : NPR
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Old 04-17-2014, 11:46 PM
Status: "Keep calm and carry on." (set 3 days ago)
Location: Memphis - home of the king
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They may not have changed as much as some animals, for example whales. That's because they are so effective at their job: eating other fish.

But given enough time, there's always room for improvement.
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Old 04-18-2014, 10:34 AM
Location: Type 0.7 Kardashev
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The whole idea that a given species 'evolves less' than any other species represents a misunderstanding of evolution.

If a particular species remains well-suited to its environment and does not exhibit as much change over a period of time as another species, that is because selective evolutionary pressures are actively working to keep the gene pool of that species well-suited to its environment.
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Old 04-18-2014, 10:44 AM
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This is also based on a misunderstanding of what a living fossil is. A living fossil just means it's part of the same family or genus of a species in the fossil record. Not that it is the same species or hasn't undergone any evolutionary changes.

Take the coelcanths. The ones in the fossil record lived in fresh water and laid eggs. The two species that have been discovered in the 20th century live in salt water ocean and give live birth. Along several other differences in their bodies.
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