Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Bikonta - bikonts |
| Corticata | |
| Archaeplastida | |
| phylum | Rhodophyta Wettst - red algae |
| subphylum | Rhodophytina |
| class | Stylonematophyceae |
| order | Stylonematales |
| family | Phragmonemataceae Skuja |
| genus | Phragmonema Zopf |
| species | Phragmonema sordidum Zopf |