Characters: Colonies are cerioid with corallites up to 50 millimetres diameter. Septa are coarsely toothed. Polyps have a fleshy mantle up to 100 millimetres diameter and with a Lobophyllia–like texture. Colour: Green, grey or brown. Similar species: Symphyllia wilsoni. The fleshy mantles are more extensive than those of any other Acanthastrea. Acanthastrea ishigakiensis has slightly smaller polyps. Habitat: Known only from moderately deep, turbid water. Abundance: Rare.