Species: Spirosperma ferox
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Hammervatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-10-08 | |
| Kvitblikkvannet | Nordland, Norway | 1 | 1 | 0 | 1992-09-09 | |
| Laksådalsvatnet | Nordland, Norway | 2 | 1 | 0 | 1992-06-02 | |
| Rossevatn | Rogaland, Norway | 2 | 1 | 0 | 1991-05-27 | |
| Skjelbreidvatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Spildervatnet | Nordland, Norway | 4 | 1 | 0 | 1993-06-10 |
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