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What a nasty looking bugger....

That critter looks like a pillbug with sharp fangs for arms/claws.
 

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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.[2] Once C. exigua replaces the tongue, some feed on the host's blood and many others feed on fish mucus. This is the only known case of a parasite functionally replacing a host organ
Ewwwwww. But very cool.
 

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It's an interesting symbiotic relationship. Bug acts as tongue, both get fed.
 
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