Cnidarian, or, Coelenterate, an animal of the phylum Cnidaria, or Coelenterata. The phylum includes the corals, hydras, jellyfish, Portuguese man-of-war, and sea anemones. Cnidarians are water-dwelling animals. The body is typically cylindrical or bell-shaped and has a single opening used for taking in food and excreting wastes. Arranged around the opening are tentacles armed with cnidocytes, cells used to sting prey and enemies. Some cnidarians live singly, others in large colonies.The cnidarian has tentacles armed with cnidocytes, cells used to sting prey and enemies.
How do coral polyps mere millimeters in length form the world's largest living structures? Will these giants of the sea last much longer if the present rate of destruction continues?
The crustacean belongs to the same major division of the animal world as spiders, lobsters, shrimp and water flies. Take this quiz and learn more about how multi-faceted this group of creatures is.