Characters: Colonies are composed of short irregular lobes. Corallites have walls formed from compacted rods and spines. Septa are composed of tapered spines which are only connected low down in the corallite. Polyps have short straight tentacles. Colour: Uniform grey, brown or pinkish, sometimes with white tentacle tips. Similar species: Alveopora fenestrata, which has a growth-form intermediate between A. marionensis and A. verrilliana, but only larger colonies can be distinguished by differences in growth-form. Polyp shapes and colours are always distinctive. Habitat: Found only in environments with moderate wave action. Abundance: Rare.