Characters: Colonies are massive with irregular corallites up to 9 millimetres diameter. Septa have large teeth and granulated sides. Paliform lobes are usually well developed. ‘Groove and tubercle’ formations are sometimes present. Colour: Dark colours, usually reddish-brown with paler oral discs. Similar species: Goniastrea aspera, which has more regular corallites with less granulated, more evenly spaced septa. See also G. columella and Platygyra contorta. Habitat: Rocky foreshores of temperate locations. Abundance: Uncommon.