Characters: Colonies are mostly submassive. Corallites are cerioid to subplocoid with moderately thin walls. Septa are thin and widely spaced. Larger septa have very long upwardly projecting teeth giving colonies a spiny appearance. Colonies are usually not fleshy. Colour: Uniform or mottled brown, yellow or green. Similar species: Acanthastrea echinata, which has relatively fleshy corallites with thicker walls and less elongate septal teeth. These two species may be difficult to distinguish unless they occur together. Habitat: Shallow reef environments. Abundance: Uncommon.