Colonies are massive or submassive and flattened. Valleys are irregular in length and shape. All skeletal structures are small for a Symphyllia, with septa being generally like those of Acanthastrea. Polyps are fleshy, with a groove along the tops of valley walls.
A wide range of mottled, green, grey, purple and brown. Valley walls and floors have contrasting colours.
Subtidal rocky foreshores of temperate localities.