| Ditoxum Gassovsky, 1919 |
| Ditoxum funinucleum Gassovsky, 1919 |
| Gassovskiella Grain, 1994 |
| Gassovskiella galea (Gassovsky, 1918) |
| Spirodiniidae Strelkow, 1939 |
| Spirodinium Fiorentini, 1890 |
| Spirodinium equi Fiorentini, 1890 |
| Tetratoxum Gassovsky, 1919 |
| Tetratoxum excavatum Hsiung, 1930 |
| Tetratoxum parvum Hsiung, 1930 |
| Tetratoxum unifasciculatum (Fiorentini, 1890) |
| Triadinium Fiorentini, 1890 |
| Triadinium caudatum Fiorentini, 1890 |
| Triadinium galea Gassovsky, 1918 |
| Triadinium minimum Gassovsky, 1918 |