Characters: Colonies are encrusting and grow to only a few centimetres across. Corallites are like a small Montastraea, are of uniform size and are closely compacted. Long and short septa alternate. Paliform lobes are well developed. Tentacles are sometimes extended during the day.
Colour: Black with white upper margins to the septa. Dried skeletons are also black and white.
Similar Species: None.
Habitat: Found only in subtidal turbid water, attached to wave washed rock.
Taxonomic Note: Very distinct species.