ClassCoscinodiscophyceae
| Taxon: | Rank: |
| Anaulales | order |
| Arachnoidiscales | order |
| Archaegladiopsophycidae | subclass |
| Asterolamprales | order |
| Aulacoseirales | order |
| Biddulphiales | order |
| Chaetocerotaceae | family |
| Chaetocerotales | order |
| Chrysanthemodiscales | order |
| Corethrales | order |
| Coscinodiscales | order |
| Cymatosirales | order |
| Ethmodiscales | order |
| Hemiaulales | order |
| Leptocylindrales | order |
| Lithodesmiales | order |
| Melosirales | order |
| Melosirophycidae | subclass |
| Orthoseirales | order |
| Paraliales | order |
| Rhizosoleniales | order |
| Rimocostatus | genus |
| Stictocyclales | order |
| Stictodiscales | order |
| Thalassiosirales | order |
| Triceratiales | order |