- Introduction to the Cnidaria
 - Jellyfish, corals, and other stingers. - Tree of Life: Cnidaria
- Provides an introduction to the aquatic phylum Cnidaria represented by polyps such as sea anemones and corals, and by medusae such as jellyfish.
- Portuguese Man-of-War
- One of Hawaii's dangerous ocean organisms.
- Hydrozoan Society
- Provides membership information as well as information on the Project Hydrozoa, a database for comparative hydrozoan biology.
- Cnidaria Home Page, The
- Collection of links dedicated to the Anthozoa, Cubozoa, Hydrozoa, and Scyphozoa.
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