1. Coral is a class of colonial animal that is related to hydroids, jellyfish, and sea anemones

2. Anyone seeing Bryozoans for the first time might mistake them for turfing seaweeds, hydroids, or tiny corals

3. Myrionema Amboinese Hydroid Hydroids are closely related to jellyfish, but unlike the jellyfish, remain attached to the reef their whole lives

4. Amphipoda carry on various activities: they bury themselves in the ground, build small houses, and live among algae and hydroids

5. Amphipoda carry on various activities: they bury themselves in the ground, build small houses, and live among algae and hydroids

6. Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes

7. The Coelenterates are mainly marine organisms and are best known as jellyfish or medusae, sea anemones, corals, the Portuguese man-of-war, small polypoid forms called hydroids, and the …

8. Cnidaria, phylum of multicellular, radially symmetrical invertebrates (eg, hydroids, jellyfish, sea anemones, corals) dating to late Precambrian era (630-570 million years ago).Formerly, phylum Coelenterata included Cnidarians and ctenophores (comb jellies)

9. Medical definition of Cnidaria: a phylum of more or less radially symmetrical invertebrate animals that lack a true body cavity, possess tentacles studded with nematocysts, and include the hydroids, jellyfishes, sea anemones, and corals.

10. Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes. Yet, these diverse animals are all armed with stinging cells called nematocysts.