Characters: Colonies are massive and meandroid, with walls forming an acute or sharp edge. Septa are uniformly exsert and have ragged margins. Columellae are well developed but do not form centres. Colour: Walls are a uniform grey-brown with pale tops. Valley floors are greenish. Similar species: Platygyra daedalea, which has weakly developed columellae. Living colonies of P. daedalea do not have walls with such acute edges. See also P. sinensis, which has more meandroid valleys and walls of uniform thickness. Habitat: Most reef environments, especially shallow fringing reefs. Abundance: Sometimes common.