Family: Hydrozetidae
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Illestadvatnet | Vestfold, Norway | 1 | 1 | 0 | 2002-08-27 | |
| Ålesundsaksla | Møre og Romsdal, Norway | 3 | 1 | 0 | 1999-09-28 |
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Illestadvatnet | Vestfold, Norway | 1 | 1 | 0 | 2002-08-27 | |
| Ålesundsaksla | Møre og Romsdal, Norway | 3 | 1 | 0 | 1999-09-28 |