Annelida
- Comprehensive information on these organisms and their phylogenetic relationships from the Tree of Life Web Project, with photographs of several species.
- http://www.tolweb.org/Annelida/2486

UCSC Annelida
- Anatomical illustrations of segmented worms from the University of California at Santa Cruz.
- http://bio.classes.ucsc.edu/bio136/annelids/annelida.html

Introduction to the Annelida
- Introduction to the Annelida, the segmented worms.
- http://www.ucmp.berkeley.edu/annelida/annelida.html

Annelida - Introduction
- Annelid worms, brought to you by Biological Sciences at the University of Paisley.
- http://orion1.paisley.ac.uk/courses/Tatner/biomedia/units/anne1.htm

Wormlab Home Page
- Photographs and links to other worm pages.
- http://www.iag.net/~seank/welcome.html

Phylum Annelida
- The segmented worms, including earthworms, polychaete worms, and leeches.
- http://animaldiversity.ummz.umich.edu/annelida.html

Center for Annelida Resources
- The Illinois Natural History Survey Annelida Collection is one of the largest state collections of freshwater oligochaetes in the USA, holding more than 300,000 specimens.
- http://www.inhs.uiuc.edu/~mjwetzel/mjw.inhsCAR.html