Transitional fossils: halfway flat fish

National Geographic’s 2009 roundup of transitional fossils included a fish that is evolving to lie concealed on the ocean floor. Modern flatfish are born symmetrical, with eyes an other side of their head, but as they age one eye moves around to the other side so that the fish can watch for danger with both eyes while lying flat on the sea floor.  The lack of “halfway” forms has been used to argue against evolution. Now, one has been found. This one appears to have one eye just over the midline. I wait for anti-evolutionists to acknowledge that the theory of evolution has been confirmed once again: Amphistium, transitional fossil, a half-way flat fish.

fossil fish

Amphistium, a transitional fossil in flatfish evolution

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