Deltocyathidae Dendrophylliidae Diploastreidae Euphylliidae Faviidae Flabellidae Fungiacyathidae Fungiidae Gardineriidae Guyniidae Lobophylliidae Meandrinidae Merulinidae Micrabaciidae Montastraeidae Oculinidae †Oulastreidae Plesiastreidae Pocilloporidae Poritidae Psammocoridae Rhizangiidae Schizocyathidae Siderastreidae Stenocyathidae †Stylinidae Turbinoliidae Mussidae accepted as Faviidae See also Environmental issues with coral reefs References External links Tree of Life – zoantharia Hexacorallia Extant Middle Triassic first appearances