Characters: Colonies are hemispherical to flat. Valleys average 20-25 millimetres wide, and are irregularly meandroid, becoming straight in flat colonies. Walls have a moderately thick fleshy appearance and usually have a groove along the top. Colour: A wide range of red, grey and green, with valleys and walls usually of contrasting colours. Red Sea colonies are usually cream. Similar species: Symphyllia radians has valleys and septa intermediate in size between the smaller S. recta and the larger S. agaricia. Symphyllia recta has more sinuous valleys, S. agaricia has a double row of columellae. Habitat: Upper reef slopes and fringing reefs. Abundance: Common.