Genus: Rhizosolenia
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Bergvikvatnet | Nordland, Norway | 2 | 1 | 0 | 1990-06-06 | |
| Bogstadvannet | Oslo, Norway | 1 | 1 | 0 | 1993-06-10 | |
| Burudvann | Akershus, Norway | 1 | 1 | 0 | 1991-09-12 | |
| Fløyta | Akershus, Norway | 2 | 2 | 0 | 1990-06-07 | |
| Hegglandsvatnet | Vestland, Norway | 1 | 1 | 0 | 1991-09-12 | |
| Klevatn | Nordland, Norway | 1 | 1 | 0 | 1993-09-07 | |
| Molbekktjernet | Østfold, Norway | 1 | 1 | 0 | 1989-09-04 | |
| Rørvatnet | Møre og Romsdal, Norway | 3 | 1 | 0 | 1991-11-04 | |
| Sagtjernet | Innlandet, Norway | 4 | 2 | 0 | 1994-10-04 | |
| Semsvannet | Akershus, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Øvre Storfjordvatnet | Nordland, Norway | 2 | 1 | 0 | 1990-05-29 | |