Sea anemones are soft-bodied, primarily sedentary marine animals that resemble flowers. They belong to the invertebrate order Actiniaria, class Anthozoa, phylum Cnidaria. They range in size from a few millimeters (a fraction of an inch) in diameter and length to about 1.5 meters (about 5 feet) in diameter. Sea anemones are also known for their nematocysts, which are microscopic stinging structures in its tentacles that are used to capture and paralyze prey such as fishes and other marine animals.
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