Colonies are hemispherical to flat and are seldom more than 0.2 metres across. Valleys are short and usually less than 25 millimetres wide. Walls are thick and in extreme cases can have an ambulacral groove which is wider than the valleys (similar to the faviid Diploria labyrinthiformis). Costae and septa are both thick. Septa have large blunt spines. Columellae are large and centred in valleys.
Exposed upper reef slopes and reef flats.