Characters: Colonies are large, free-living, circular to oval, dome-shaped and heavily constructed, without an axial furrow. Corallites are compact. Septa vary little in height. Tentacles are extended only at night. Colour: Usually pale or dark brown or green, sometimes mottled and sometimes with purple margins and white corallite centres. Similar species: Sandalolitha dentata, which is irregular in shape and less domed, with widely spaced corallites. Habitat: Most reef habitats. Abundance: Common.