The only parasite that functionally replaces an organ. The tongue-eating louse (Cymothoa exigua) is one of the strangest and most disturbing parasites in the animal kingdom. It enters through the gills of a fish and attaches itself to the base of the tongue. It severs the blood vessels, causing the tongue to wither and fall off. Then it replaces the tongue, attaching itself to the stump and functioning like a prosthetic tongue. The fish can still eat and live normally—with the louse acting as its new tongue.

Believer, husband, dad, optimist // Strategy & design at Crema // Expert dabbler // Steward of /pony /midwest /aethletics tylerhilker.com

This louse are not replacing the tounge, you may find them in gills and tounge but not replacing it. I know it coz my father is a fisherman and everytime he brought bigeye scad at home.

Thanks for sharing, that’s pretty cool.

They are different in shape but same species..

Whoa, firsthand experience! How big are these things?