Characters: Colonies are submassive or encrusting. Corallites are 4-7 millimetres diameter and are thick walled with prominent skeletal structures. Costae are strongly beaded. The coenosteum is densely covered with thick, finely elaborated spinules. Colour: Mustard, green, brown or purple, often with pale septo-costae. Similar species: Echinopora irregularis. See also E. horrida and E. gemmacea, which have less coarse corallite structures and smaller corallites. Habitat: Shallow reef environments. Abundance: Sometimes common in the western Indian Ocean, rare elsewhere.