Characters: Colonies are small, encrusting or laminar. Corallites are 2.5-3 millimetres diameter and are widely separated. The coenosteum is blistery. Septa are in two unequal cycles. Colour: Grey or greenish-brown. Similar species: Corallites are smaller than those of other Galaxea and septa are in two well defined cycles. Habitat: Lower reef slopes protected from wave action. Abundance: Usually rare.