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An anemone in the Ross Sea, Antarctica. Sea anemones are a group of water-dwelling, predatory animals of the order Actiniaria. They are named for the anemone, a terrestrial flower. Sea anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia. Anthozoa often have large polyps that allow for digestion of larger prey and also lack a medusa stage.
As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and Hydra.Image credit: Steve Rupp, National Science Foundation
