These are very simple worms that swim around in dark caves. They live on bacteria and get eaten by just about anything else in the cave. All the species of worm here are descended from a common ancestor, a bristleworm that survived the mass extinction by living in caves.
The gloomworm lives above the water level on the cave walls below the Central Desert
These worms feed on the green bacterial meadows formed on the wall of the caves in which they live.