• Introduction to the Phoronida - Introduction to the Phoronida, a small phylum related to brachiopods and bryozoans.
• Phoronida - Four photographs of the Horseshoe Worm, Phoronis hippocrepia.
• Phoronida - Illustration of the internal anatomy of a horseshoe worm and a list of species.
• Phoronida - Geographical distribution, systematics (including relationship to other lophophorates), list of species, scientific papers, links. Site is in English, Spanish, and French.
• Phoronida World Database - Commonly known as horseshoe worms, this phylum is an exclusively marine group of lophophorate animals. Provides a searchable taxon tree.
• Phoronis architecta - Information from Invertebrate Anatomy OnLine on this species and its classification, with a detailed account of its external anatomy and its actinotroch larva.

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