Characters: Colonies are submassive, columnar or encrusting and commonly exceed 2 metres across in turbid water. Corallites sometimes vary greatly in size depending on where they occur on the colony; they are usually 3-4.5 millimetres diameter. Usually eight to twelve septa reach the corallite centre. Tentacles are seldom fully extended during the day.
Colour: Usually grey, also pink, green or brown.
Similar species: Galaxea paucisepta, which has smaller corallites. See also G. cryptoramosa.
Habitat: Reef environments protected from strong wave action.
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