Gerridae
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Østernvannet | Akershus, Norway | 1 | 1 | 0 | 1990-08-28 | |
| Øygårdsvannet | Agder, Norway | 1 | 1 | 0 | 2015-06-20 | |
| Øymarksjøen | Østfold, Norway | 4 | 4 | 0 | 1997-05-29 | |
| Åletjern | Telemark, Norway | 1 | 1 | 0 | 2000-06-06 | |
| Ålvatnet | Trøndelag, Norway | 9 | 2 | 0 | 2013-09-04 | |
| Årnestangen | Akershus, Norway | 1 | 1 | 0 | 2003-06-06 | |
| Åros | Akershus, Norway | 1 | 1 | 0 | 2013-09-19 | |
| Årstadtjødne | Rogaland, Norway | 4 | 2 | 0 | 1996-10-11 | |
| Årungen | Akershus, Norway | 10 | 3 | 0 | 1996-09-16 |