University of California
Ucmp: Annelids Life and History
Description of the life history and ecology of Annelids.
BiologyWise
Biology Wise: Common Earthworm Classification and Characteristics
The taxonomic classification of the earthworm is described and its anatomical characteristics.
PBS
Nh Pbs: Nature Works: Decomposers
This site gives a detailed overview of "decomposers": bacteria, fungi, and earthworms. Content includes a look at how decomposers contribute to a symbiotic relationship.
Monterey Bay Aquarium
Monterey Bay Aquarium: Acorn Barnacle
Meet the acorn barnacle and learn cool facts, its natural history, and conservation status.
Canadian Museum of Nature
Canadian Museum of Nature: Leeches
Leeches are found all over the world in both fresh and salt water, yet people tend to know little about them. Some facts and photos of these misunderstood creatures are found here.
University of Michigan
Animal Diversity Web: Subclass Hirudinea [Leeches]
This resource gives a brief description of the subclass Hirudinea and the role they have played in medicine.