Characters: Polyps are circular, helmet-shaped and up to 80 millimetres diameter, with a concave undersurface. Primary septa are thick and exsert around the mouth. Colour: Pale cream or brown, sometimes with violet margins. Similar species: Cycloseris tenuis. Cycloseris cyclolites is more strongly dome-shaped and septa around the mouth are less exsert. See also C. erosa and Fungia granulosa which are larger and thicker. Habitat: Soft inter-reef substrates and lower reef slopes protected from wave action. Abundance: Rare