Characters: Colonies are commonly over 5 metres across and are composed of contorted branches and flat plates. Rarely submassive. Corallites are conical, 7-10 millimetres diameter. The coenosteum is smooth or nearly so. Costae are smooth or slightly beaded. Columellae are twisted into a spiral. Colour: Distinctive cream with blue (which may photograph purple) corallites. Similar species: Echinopora horrida and E. gemmacea may both have similar growth-forms but both have spines down their costae and a spiny coenosteum. Habitat: Shallow water, especially lagoons and back reef margins. Abundance: Common.