• Class Sipunculidea
  • Order Sipunculiformes
    • Family Sipunculidae
  • Order Golfingiiformes
    • Family Golfingiidae
    • Family Phascolionidae
    • Family Themistidae
• Class Phascolosomatidea
  • Order Phascolosomatiformes
    • Family Phascolosomatidae
  • Order Aspidosiphoniformes
    • Family Aspidosiphonidae

The Sipuncula, sipunculid worms or peanut worms, are a phylum containing 144 species of marine worms, with a tentacle-surrounded mouth on a completely invertible head end. Some of the larval characteristics are similar to the mollusks.

Sipunculid worm jelly (土笋冻) is a delicacy in the town of Xiamen in Fujian province of China.

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Sipuncula taxa with synonyms