Genus
Ostiana Hermann, 1976
Classification
| Organism group | Biota |
| Domain | Bacteria |
| Kingdom | Bacillati |
| Phylum | Cyanobacteriota |
| Class | Cyanophyceae |
| Order | Nostocales |
| Oscillatoriales | |
| Pseudanabaenales | |
| Family | Garwoodiaceae |
| Girvanellaceae | |
| Genus | Ostiana |
| Species | aphanothece |
| microcystis |