- Sipuncula means little tube.
- Sipunculans are commonly called "peanut worms" based on their appearance. When their introvert is retracted they look like shelled peanuts.
- There are 320 known species, all of which are marine.
- They are found in all oceans, in all temperatures, and can be found in depths ranging from intertidal to approximately 7000 meters.
- Some species make their home by burrowing into sand/mud. Other species live in rock crevices, empty shells, or bore into rock.
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