Toxicological trivia from April 03, 2014: The phylum Coelenterata is an obsolete term encompassing two animal phyla, the Ctenophora (comb jellies) and the Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their allies). Anemones is simple, radial, tentacled animals. These tentacles capture prey and have a small oval bearing cells called nematocysts able to inject venom.  Each nematocyst contains a small vesicle filled with toxins (actinoporins), an inner filament, and an external sensory hair. A touch to the hair mechanically triggers a cell explosion—which launches a harpoon-like structure that attaches to organisms that trigger it, and injects a dose of venom in the flesh of the aggressor or prey. This gives the anemone its characteristic sticky feeling. The sea anemone eats small fish and shrimp.  Do anemones and corals belong to which of the following classes?: a) Anthozoa; b) Hydrozoa; c) Class Scyphozoa.

Correct Answer a. Read more on page 86 of the Manual de diagnóstico e Tratamento de acidentes por animais peçonhentos  del FUNASA (Brasil) , in Portuguese language.