The name Cnidaria comes from the Greek word "cnidos", which means stinging nettle. When you touch the nematocysts it releases barbed threads tipped with poison. There are thousands of cnidaria species in the worlds oceans. There are even some species that are found in rivers and fresh water lakes.Cnidarians have four main groups. One of the main groups is the Anthozoa, it includes true corals, anemones, and sea pens. The Anthozoans are the most famous cnidarians. They have a long fossil record that extends back at least 550 million years. Polyp-like and sea pen-like fossils are most likely the oldest entozoan. In the Cambrian period the first mineralized coral-like organisms appeared. The true corals, the kind that is living in our time today, did not appear until the middle Triassic era.Another one of the main groups of cnidarians are Cubozoa. The Cubozoa are known sometimes as the box jellies. Box jellies are similar in form to the normal “jellyfish”. But it is easy to tell the two groups apart from each other, Cudozoa are square shaped when viewed from above. They have......

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