| Septonema Corda, 1837 |
| Septonema fragile R. F. Castañeda, 1988 |
| Sinophysis Nie & C. Wang, 1944 |
| Sinophysis canaliculata Quod, Ten-Hage, Turquet, Mascarell & Couté, 1999 |
| Sinophysis microcephalus Nie & C. Wang, 1944 |
| Solenastrea Milne-Edwards & Haime, 1848 |
| Solenastrea bournoni Milne-Edwards & Haime, 1849 |
| Solenastrea ecuadoriana Durham & Barnard, 1952 |
| Solenastrea hyades (Dana, 1846) |
| Solicorynespora R. F. Castañeda & W. B. Kendr., 1990 |
| Solicorynespora foveolata (Pat.) Shirouzu & Y. Harada, 2008 |
| Solicorynespora pseudolmediae (R. F. Castañeda) R. F. Castañeda & W. B. Kendr., 1990 |
| Solosympodiella Matsush., 1971 |
| Solosympodiella clavata Matsush., 1971 |
| Spegazzinia Sacc., 1879 |
| Spegazzinia deightonii (S. Hughes) Subram., 1956 |
| Spegazzinia tessarthra (Berk. & M. A. Curtis) Sacc., 1886 |
| Speiropsis Tubaki, 1958 |
| Speiropsis belauensis Matsush., 1985 |
| Speiropsis hyalospora Subram. & Lodha, 1964 |