| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Calciosoleniaceae | 1 | 0 | 0 |
| Calyptrosphaera Lohmann 1902 | 0 | 0 | 10 |
| Calyptrosphaeraceae | 4 | 0 | 0 |
| Caneosphaera Gaarder 1977 | 1 | 0 | 2 |
| Caneosphaera molischii (J. Schiller) Gaarder | 0 | 0 | 4 |
| Catenulaceae | 1 | 0 | 0 |
| Cerataulina (角管藻屬) | 2 | 0 | 2 |
| Cerataulina bergonii Ostenfeld 1903 | 0 | 0 | 2 |
| Cerataulina pelagica | 0 | 0 | 18 |
| Ceratiaceae (角甲藻科) | 2 | 0 | 0 |
| Ceratium Schrank 1793 (角藻屬) | 30 | 0 | 0 |
| Tripos arietinus | 0 | 0 | 2 |
| Tripos azoricus | 0 | 0 | 2 |
| Ceratium boehmii | 0 | 0 | 2 |
| Tripos candelabrum | 0 | 0 | 4 |
