Characters: Colonies are massive (especially in shallow water) or encrusting. The surface is usually irregular, with sinuous valleys 4-8 millimetres wide. Columellae are well developed although interlinked. Ambulacral grooves, if present, are fine. Colour: Greys and browns, usually with walls and valleys of contrasting colours. Similar species: Diploria strigosa. Habitat: Most reef environments, especially shallow slopes and lagoons. Abundance: Common.