- Saccosporidae Canning, Okamura & Curry, 1996
- Schulmania Kovaljova, Zubchenko & Krasin, 1983
- Septemcapsula Hsieh & Chen, 1984
- Sinuolinea Davis, 1917
- Sinuolineidae Shulman, 1959
- Sphaeractinomyxon Caullery & Mesnil, 1904
- Sphaeromyxa Thélohan, 1892
- Sphaeromyxidae Lom & Noble, 1984
- Sphaeromyxina
- Sphaerospora Thélohan, 1892
- Sphaerosporidae Davis, 1917