Tetraedron minimum
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Dælivannet | Akershus, Norway | 2 | 1 | 0 | 1991-09-07 | |
| Grindheimsvatnet | Agder, Norway | 1 | 1 | 0 | 1989-09-19 | |
| Haukvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1989-09-22 | |
| Tretjønnet | Agder, Norway | 1 | 1 | 0 | 1990-06-26 | |
| Vikerauntjønna | Trøndelag, Norway | 3 | 1 | 0 | 1990-09-28 |