• The City Naturalist - Earthworms - Short account of earthworms; an article by Leslie Day.
• Earthworm Biology and Production - Information circular from University of Florida, Institute of Food and Agricultural Sciences.
• Earthworm Information - Extensive information about individual species, ecology and biology, and role in agriculture.
• Lumbricus terrestris - Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of the earthworm.
• Oligochaeta - A nice summary of the families of freshwater Oligochaetes found in North America.
• Worm Biology - Information on the anatomy of earthworms, different types, worms as bait, invasive species and worm reproduction.

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