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.
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.