• Golfingia vulgaris - Photograph of this sipunculid.
• Introduction to the Sipuncula - Introduction to the peanut worms, from UCMP Berkeley.
• Phascolopsis gouldi - Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of this peanut worm.
• Sipuncula - Information on the classification of the peanut worms with a photograph of Phascolopsis gouldii.
• Sipuncula - Checklist of species in this phylum from the European Register of Marine Species.
• Sipuncula: Peanut Worm - Provides illustrated notes on the biology of these worms.
• Sipunculus nudus - Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of this peanut worm.

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