injuries poisoning
Cnidaria (Coelenterates, such as Jellyfish and Sea Anemones) Stings
Introduction
Cnidaria include the following: Corals Sea anemones Jellyfish (including sea nettles) Hydroids (eg, Portuguese man-of-war) Cnidaria are responsible for more envenomations than any other marine animal. However, of the 9000 species, only about 100 are toxic to humans. The multiple, highly developed stinging units (nematocysts) on cnidaria tentacles can penetrate human skin; one tentacle may fire thousands of nematocysts into the skin on contact. 