Characters: Colonies usually consist of a few corallites but may become large and hemispherical. Corallites are large, phaceloid and mostly monocentric. Septa have tall sharp teeth. Polyps are thick and fleshy, with a rough surface.
Colour: Blue-grey, sometimes with pale valley floors or septo-costae. All corallites of the same colony have the same colour.
Habitat: Most reef environments.