Characters: Colonies are massive and subplocoid. Septa are uniformly spaced with 8-10 evenly spaced, rounded teeth. Teeth on adjacent septa are often aligned, forming concentric circles. Some septa are more prominent than others. Columellae are weakly developed. Colonies do not have thick tissue over the skeleton. Colour: Variable brown and yellow-brown, usually with contrasting corallite walls and centres. Similar species: May resemble the faviids Montastrea and Favia species more than other Acanthastrea underwater. See also A. faviaformis. Habitat: Shallow reef environments. Abundance: Uncommon