Position in a system
| system | Vitae - living organisms |
| domain | Bacteria (Haeckel, 1894) Woese, Kandler Wheelis, 1990 - bacterians |
| phylum | Cyanobacteria Stanier ex Cavalier-Smith, 2002 - blue-green algae |
| class | Cyanophyceae Schaffner, 1909 |
| subclass | Oscillatoriophycidae |
| order | Oscillatoriales Cavalier-Smith, 2002 |
| family | Phormidiaceae Anagnostidis & Komárek, 1988 |
| Phormidiaceae incertae sedis | |
| genus | Hydrocoleum Kützing ex Gomont, 1892 |
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