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They are marine filter feeders with a sac-like body structure. This is a tunicate that forms tough, globular colonies measuring an inch or more in height. They are rubbery or cartilaginous to the touch. Red zooids are arranged in circular groups under the tunic, which is creamy pink to purple in color. Colonies can become large, spreading 12 inches or more. Sea pork got its name because after death, the rubbery tunic bleaches to white, resembling salt pork or fatback.