Corals are solitary, free-living (except for juveniles), flat with a central mouth. Septa have large lobed teeth. Polyps are extended day and night and are the largest of all corals. They have long dark-purple or green tentacle with pale tips, very similar to those of giant anemones. The oral disc is striped and there is one mouth up to 30 mm wide. Abundance: commonly found on flat soft or rubble substrates, usually in reef lagoons. Very conspicuous. (Veron, 1986 <57>)