A coral disease characterised by darkly pigmented areas of tissue on stony corals.-At present, there is no known pathogen. The coral tissue remains intact, although at times lesions and coral tissue death are observed in the centres of the pigmented areas. Tissue loss is minimal, if present. This disease is widespread throughout the Caribbean.-For additional information and illustrations, see: http://www.coral.noaa.gov/coral_disease/dark_spots.shtml.