Characters: Colonies are massive, becoming thin encrusting plates where light levels are low. They commonly grow as mobile balls (coralliths). Corallites are tall and conical; compact in colonies exposed to strong light, widely spaced in encrusting colonies. They usually have 10 primary septa although this varies among corallites. Colour: Brown, cream or green, sometimes other colours. Septa are commonly white. Similar species: Cyphastrea microphthalma is readily identified by its 10 primary septa which are visible underwater. Habitat: Most reef environments. Abundance: Common, but less so than C. serailia.