Montipora is a genus of small polyp stony coral in the phylum Cnidaria. Depending on the species and location, Montipora may grow as plates or ridges, appearing to some as a bowl or flower. Undisturbed, the plates expand radially and may encrust over surrounding rocks, shells or debris. These corals are extremely common on reefs in the Red Sea, the western Indian Ocean and the southern Pacific Ocean, appearing as far north as Hong Kong. There are seventy five known species.