The phylum Sipuncula includes about 320 species of marine creature, some resembling sea cucumbers and others sprouting potatoes, with their tentacled mouths at the end of the sprouts. They are thought to be related to the molluscs, annelids and arthropods.
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- Introduction to the Sipuncula Introduction to the peanut worms, from UCMP Berkeley.
- Sipuncula Information on the classification of the peanut worms with a photograph of Phascolopsis gouldii.
- Sipuncula: Peanut Worm Provides illustrated notes on the biology of these worms.