Includes Jellyfish, hydroids, anemones, coral, etc. Interesting Facts: - All cnidarians have venomous stinging cells in their tentacles, called nematocysts - Some think coral are plants, but they are actually made up of hundreds of cnidarian larvae, ?called polyps - Have symbiotic relationships with animals such as the boxer crab and the clownfish Field Guide Cnidarian: Giant green anemone - Anthopleura xanthogrammica