Sipunculans were once grouped with the annelids, even though they lack segmentation and bristles on the body. Later, Sipunculans were grouped with the molluscs because of similar developmental and larval characteristics. Sipunculans are now in their own phylum, but the close relationship between molluscs and annelids is still recognized.
Sipunculans have been recognized for their role in bioerosion of coral reefs and as an indicator of environmental health. They are also an important food source for fish and invertebrates.
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