University of Guelph
Invertebrates
Site provides a comprehensive guide to anyone seeking information on invertebrates. Provides links to morphology, biodiversity, ecology and habitats.
CK-12 Foundation
Ck 12: Biology: Invertebrate Characteristics
[Free Registration/Login may be required to access all resource tools.] Covers characteristics of invertebrates.
Other
Sea Gallery: Invertebrates
Dive into a virtual gallery of invertebrates found in the sea. Discover how these creatures get around and find their next meal.