Hydrozoa
Horia's Marine Biology Page, Midwater Hydromedusae, Obelia colony, Obelia Laboratory Exercises
Cnidaria
Information and resources for researchers studying all aspects of cnidarian biology.
Cnidaria (Coelenterata)
An attractive and informative site from the Tree of Life Project, by Daphne G. Fautin and Sandra L. Romano.
Coral Health and Monitoring Program
Services to help improve and sustain coral reef health throughout the world. Part of an international network of coral reef researchers.
Introduction to the Cnidaria
Sea anemones, medusae, jellyfish, corals.
Phylum Cnidaria
General information about the phylum that includes jellyfish, coral, hydra.
ReefBase
World Conservation Monitoring Center - A global database on coral reef systems and their resources.
Tropical Australian Stinger Research Unit
Information about the biology and ecology of box jellyfish (Cubozoa), plus how to prevent and treat stings and current research in Queensland, Australia.
Underwater Field Guide to Cnidarians of Ross Islan
Spectacular photographs of Antarctica's sea anemones, jellyfish, hydroids and soft coral.