Hereâ€™s a picture from a story making the rounds because it turned up in a London fishmarket. Itâ€™s Cymothoa exigua, a fish parasite.
The 3.5cm creature had grabbed onto the fishâ€™s tongue and slowly ate away at it until only a stub was left.
It then latched onto the stub and became the fishâ€™s â€œreplacement tongueâ€.
The bugs are usually found off the coast of California, so itâ€™s possible the fish was imported to the UK.
Here are two pictures from the London story:
Hereâ€™s a pic from a web site about parasites:
Be glad you have hands to pull it off you if it bites your tongue. The poor fish is stuckâ€“his fins canâ€™t reach in and grab it!