Eastoff
But it was a beginning.
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http://en.wikipedia.org/wiki/Cymothoa_exigua
Cymothoa exigua or the Tongue eating louse is a parasitic crustacean of the family Cymothoidae. It tends to be 3 to 4 cm long. This parasite enters through the gills, and then attaches itself at the base of the spotted rose snapper's (Lutjanus guttatus) tongue. It then proceeds to extract blood through the claws on its front three pairs of legs. As the parasite grows, less and less blood reaches the tongue, and eventually the organ atrophies from lack of blood. The parasite then replaces the fish's tongue by attaching its own body to the muscles of the tongue stub. The fish is able to use the parasite just like a normal tongue. It appears that the parasite does not cause any other damage to the host fish.[1] Once C. exigua replaces the tongue, some feed on the host's blood and many others feed on fish mucus. They do not eat scraps of the fish's food.[2] This is the only known case of a parasite functionally replacing a host organ.[3] It is currently believed that C. exigua are not harmful to humans unless picked up alive, in which case they can bite.[4]
