Kingdom Animalia Linnaeus, 1758 - animals Phylum Echinodermata Bruguière, 1789 - echinoderms Subphylum †Homalozoa Whitehouse, 1941 1 Class †Stylophora Gill & Caster, 1960 - stylophorans 2 Class †Homoiostelea Gill & Caster, 1960 3 Class †Homostelea Gill & Caster, 1960 4 Class †Ctenocystoidea Robison & Sprinkle, 1969