 WormWatch
 - National volunteer program designed to help identify ecological changes by monitoring earthworms.- Amazing World of Annelids
- Introduction to the Annelida, a medium sized phylum of more than 9,000 species of worms.
- Annelid Resources
- Guide to scientific information on annelids, and to current worm research and researchers.
- Annelida
- Characteristics of segmented worms: bristleworms, ragworms, earthworms, leeches, and their allies.
- Illinois Natural History Survey Center for Annelida Resources
- Introduction to the Annelida
- Segmented worms make up the Phylum Annelida.
- Phylum Annelida (Segmented Worms)
- Introduction to earthworms, polychaete worms, and leeches, from the Animal Diversity Web.
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