
Cymothoa exigua is a parasitic isopod that enters a fish through the gills, severs the blood vessels of its tongue until the organ withers, then attaches itself to the stub and functions as a working replacement tongue for the rest of the fish’s life
Cymothoa exigua enters a fish through the gills, severs the blood vessels of its tongue until the organ falls off, and then attaches to the stub and functions as a working replacement tongue for the rest of the fish's life — the only known case of a parasite anatomically replacing a host organ.












