Characters: Colonies are massive, becoming hemispherical. Valleys are short, usually with less than three centres. Septa are in two orders, with tall teeth. Columellae are well formed. Colour: Mottled or uniform brown, grey, green or cream. Similar species: Acanthastrea hillae also has a tendency to form valleys with multiple centres. See also A. ishigakiensis. Habitat: Most reef environments. Abundance: Sometimes common