- Aspidogastrea
 - Lists the characteristics of, and provides an identification key for, the small group of flukes. - Introduction to the Platyhelminthes: Life in Two Dimensions
- Commonly called flatworms, they are the simplest animals - bilaterally symmetrical and triploblastic.
- Marine Flatworms of the World
- Devoted to the study of polyclad flatworms, a group of large, free-living marine flatworms which are mainly found in tropical coral reefs.
- Nembro
- Offers photographs of, and geographic distribution information for, the colourful Nudibranchs, sea slugs, and flatworms. Also in French.
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