Subclass: Igler (Hirudinea)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Vålåsjøen | Innlandet, Norway | 1 | 1 | 0 | 1989-08-24 | |
| Øggardselva | Møre og Romsdal, Norway | 1 | 1 | 0 | 1995-05-24 | |
| Ørnakkelva | Nordland, Norway | 1 | 1 | 0 | 1994-05-06 | |
| Øvre Storfjordvatnet | Nordland, Norway | 2 | 1 | 0 | 1990-05-29 | |
| Øygårdsvannet | Agder, Norway | 1 | 1 | 0 | 2015-06-20 | |
| Åletjern | Telemark, Norway | 1 | 1 | 0 | 2000-06-06 | |
| Årnestangen | Akershus, Norway | 1 | 1 | 0 | 2003-06-06 | |
| Årungen | Akershus, Norway | 6 | 4 | 0 | 1992-09-20 | |
| Åstveitvannet | Vestland, Norway | 1 | 1 | 0 | 1989-09-07 |
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