Characters: Colonies are massive and cerioid, with laterally compressed corallites of uneven height. Walls are acute: septa are thick, with large teeth. Columellae are barely developed. Colonies have a thick fleshy mantle which is covered by fine papillae. Colour: Very colourful: red, purple and green are the most common colours, with corallites and walls almost always of contrasting colours. Similar species: Micromussa amakusensis. See also Acanthastrea echinata. Habitat: Shallow reef environments especially of subtropical localities. Abundance: Sometimes common