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. Underwater Creatures, Underwater Life, Ocean Creatures, Underwater Plants, Underwater Pictures, Saltwater Tank, Saltwater Aquarium, Aquarium Fish, Aquarium Gravel