What exactly are "creatures of light?" As it happens, they are those organisms that employ bioluminescence, the "generation of light by living things." This dramatic online exhibit from the American Museum of Natural...

This in depth site covers Cnidarian life history, ecology, morphology, systematics, and fossil record. Organisms described include corals, anemones, sea pens, box jellies, siphonophores, hydroids, fire corals, medusae,...

This site provides an introduction to ctenophores, or "comb jellies". Site includes links to information on Cnidarians (jellyfish, etc.), echinoderms, and sponges. Two images of ctenophores are included.