Tongue Thief Creature Guide and Details | Subnautica 2

A parasitic yellow crab-like creature that latches onto the host's tongue and causes intense hunger.

Ostrakonskelos glossaklept, the hard-legged tongue thief. A parasitic crab or louse that dwells in the mouth, causing intense and unremitting hunger.

[1] Crablike body plan
A close relative of other Protean crabs, belonging to the infraorder Adulati. The segmented body has two cerci, nerve-rich organs which evolved from legs. The mouthparts are simple. The tongue thief relies on its host to chew food.

[2] Parasitic hijack
Tongue thieves mimic other prey species until swallowed, then use a numbing agent to paralyze the predator's jaw long enough to anchor to the tongue. This numbing agent blocks the nerves that signal satiety (fullness) to the brain.

[3] Semi-cooperative hunting
Although they are parasites, tongue thieves' mall eyes and grasping limbs help the host latch onto food.

[4] Reproduction
Tongue thieves anchor eggs or spermatophores in the mouth of their host, where they wait for a thief of the opposite sex to arrive. Infant tongue thieves (called manca) pass through the host's digestive tract.

[5] Possible cultural function
In the same way some human cultures use capsaicin in food, it is conceivable that other organisms might develop a taste for the tongue thief's numbing agent. Personal experimentation would be ill-advised.

Assessment: expel parasite to reduce host hunger. Be alert for juveniles who may attempt to infest your mouth.

They are frequently swallowed by the Epicurean, which mistakes them for prey. Once the Tongue Thief infects the Epicurean, it becomes more aggressive and dangerous. Use a Sonic Resonator to remove it.