Common name: Peanut Worms
Sipuncula, commonly known as peanut worms, are a group of marine worms found in oceans worldwide. They belong to a phylum of unsegmented benthic marine worms known for their distinctively retractable body structure, which resembles a peanut when contracted. This unique feature allows them to hide within the substrate or crevices, providing protection from predators.
Peanut worms are detritivores, meaning they feed on organic matter found in the sediment. This makes them beneficial inhabitants of reef aquariums, as they contribute to the breakdown of waste and help maintain a clean substrate. They are generally non-aggressive and can coexist peacefully with other marine life, making them a suitable addition to a diverse marine ecosystem.
These worms have a simple body structure, consisting of a trunk and an anterior introvert, which can be extended for feeding and movement. While they are not typically visible during the day, they may become more active at night. Their ability to burrow into the sand or live rock also helps aerate the substrate, promoting a healthy aquarium environment.
For hobbyists, peanut worms require minimal care. They thrive in a stable marine environment with adequate hiding spots and a well-maintained substrate. Monitoring the overall health of the aquarium and ensuring a balanced ecosystem will support their wellbeing. While they are not often deliberately introduced, they may appear as hitchhikers on live rock or sand, bringing unexpected benefits to the aquarium.