Sipunculans are non-segmented worm-like organisms that have a retractable part at the front, called introvert which allows them to bury themselves in the sediment. The mouth lies at the end of the introvert.
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-muelleri-muelleri-0p.jpg "Aspidosiphon (Aspidosiphon) muelleri muelleri")
-elongata-0p.jpg "Golfingia (Golfingia) elongata")
-nudus-0p.jpg "Sipunculus (Sipunculus) nudus")