Reef-building stony corals (hermatypic corals) require endosymbiotic algae from the genus Symbiodinium to be in a healthy condition.
ɹˈiːfbˈɪldɪŋ stˈoʊni kˈɔːɹəlz hˌɜːmɐtˈɪpɪk kˈɔːɹəlz ɹᵻkwˈaɪɚɹ ˌɛndoʊsˌɪmbaɪˈɑːɾɪk ˈælɡiː fɹʌmðə dʒˈɛnəs sˌɪmbɪədˈɪniəm təbi ɪn ɐ hˈɛlθi kəndˈɪʃən.