Sexual Reproduction in Freshwater Jellyfish
- Some fine photographs and an explanation of this process, provided by Gen-yu Sasaki.
- http://www.ct.sakura.ne.jp/~gen-yu/sowerbyi/fwjelly2.html

Freshwater Jellyfish: Craspedacusta sowerbyi
- Photographic study by Gen-yu Sasaki of these organisms.
- http://www.microscopy-uk.org.uk/mag/artnov99/fwjelly.html

Jellyfishes
- Photographic study by Jean-Marie Cavanihac of these marine organisms, with some animated sequences.
- http://www.microscopy-uk.org.uk/mag/artjun03/jmcmedusa.html

Sea Wasps and other Nightmares
- Article by Richard Howey on jellyfish and other creatures of the sea that have stinging cells or produce toxins.
- http://www.microscopy-uk.org.uk/mag/artjun00/rhwasp.html

Flowers of the Sea: Cnidaria
- Photographic study by Jean-Marie Cavanihac of these marine organisms.
- http://www.microscopy-uk.org.uk/mag/artmay01/cnidaria.html

Cnidaria
- Information from Wikipedia on this phylum of aquatic organisms that were previously called the Coelenterata.
- http://en.wikipedia.org/wiki/Cnidaria

ASIRA: Captive Coral Care
- Provides information designed to help educate aquarists on the basics of marine biology and chemistry and on the proper care of common aquarium corals.
- http://www.asira.org/caresheets

Reef Corals of the Indo-Malayan Seas
- Identification key to the corals of the waters of Indonesia and adjacent territories, including members of classes Hydrozoa (hydrocorals), and Anthozoa (black corals, stony corals, soft corals and sea pens). Includes about 3500 colour pictures and interac
- http://ip30.eti.uva.nl/bis/corals.php

Cnidaria (Coelenterata)
- An attractive and informative site from the Tree of Life Project, by Daphne G. Fautin and Sandra L. Romano.
- http://tolweb.org/tree?group=Cnidaria&contgroup=Animals

Underwater Field Guide to Cnidarians of Ross Island and McMurdo Sound, Antarctica
- Spectacular photographs of Antarctica's sea anemones, jellyfish, hydroids and soft coral.
- http://scilib.ucsd.edu/sio/nsf/fguide/cnidaria.html

Introduction to the Cnidaria
- Sea anemones, medusae, jellyfish, corals.
- http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html

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.
- http://coral.aoml.noaa.gov/

Phylum Cnidaria
- General information about the phylum that includes jellyfish, coral, hydra.
- http://animaldiversity.ummz.umich.edu/cnidaria.html