| Circinotrichum papakurae S. Hughes & Piroz., 1971 |
| Cladocora Ehrenberg, 1834 |
| Cladocora arbuscula (Lesueur, 1821) |
| Cladocora debilis Milne-Edwards & Haime, 1849 |
| Cochlodinium F. Schütt, 1896 |
| Cochlodinium catenatum Okamura, 1916 |
| Cochlodinium cavatum Kof. & Swezy, 1921 |
| Cochlodinium citron Kof. & Swezy, 1921 |
| Cochlodinium constrictum (F. Schütt) Lemmerm., 1899 |
| Cochlodinium faurei Kof. & Swezy, 1921 |
| Cochlodinium fulvescens M. Iwataki, H. Kawami & Matsuoka, 2007 |
| Cochlodinium miniatum Kof. & Swezy, 1921 |
| Cochlodinium pirum (F. Schütt) Lemmerm., 1899 |
| Cochlodinium polykrikoides Margalef, 1961 |
| Cochlodinium schuetti Kof. & Swezy, 1921 |
| Cochlodinium strangulatum (F. Schütt) F. Schütt, 1896 |
| Cochlodinium virescens Kof. & Swezy, 1921 |
| Condylospora Nawawi, 1976 |
| Condylospora flexuosa Nawawi & Kuthub., 1988 |
| Copelandia Bres., 1912 |