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The soft-bodied sea anemones are large soft-bodied . The is usually brightly colored, always solitary, and found in coastal waters world-wide, but are particularly common in the tropics. In size they are usually from 1.5 to 5 cm in diameter, although giant forms like columbiana (North Pacific USA) and Stoichactus sp. (Great Barrier Reef, Australia) may reach over a meter at the oral (mouth) end.
The outer tentacles are much divided, giving a frilly appearance.
The mouth occurs in the middle of a flat area called the ; the mouth and below are oval in shape. There are usually two ciliated grooves called , found the length of the pharynx, that create a current of water into the "stomach" (gastrovascular cavity), which maintains a skeleton, against which the muscles can act.