Subclass: Igler (Hirudinea)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Fløyta | Akershus, Norway | 3 | 1 | 0 | 1993-05-27 | |
| Fossevatna naturreservat | Vestland, Norway | 2 | 1 | 1 | 2006-05-04 | |
| Frøtjønnbekken | Agder, Norway | 4 | 1 | 0 | 1996-05-13 | |
| Frøylandsvatnet | Rogaland, Norway | 18 | 4 | 0 | 1993-06-01 | |
| Førdesfjorden | Rogaland, Norway | 1 | 1 | 0 | 2013-09-20 | |
| Gaupåsvatnet | Vestland, Norway | 1 | 1 | 0 | 2007-08-29 | |
| Gauro | Vestland, Norway | 1 | 1 | 0 | 1993-10-21 | |
| Gihle gårdsdam | Innlandet, Norway | 1 | 1 | 0 | 2013-09-18 | |
| Gjellumvannet | Akershus, Norway | 1 | 1 | 0 | 2017-09-18 | |
| Glitredammen | Akershus, Norway | 2 | 2 | 0 | 2004-09-03 | |
| Gravdalsvatnet | Vestland, Norway | 2 | 2 | 0 | 1989-09-18 | |
| Greverudbekken | Akershus, Norway | 5 | 1 | 0 | 1994-06-01 | |
| Grobekken | Agder, Norway | 4 | 1 | 0 | 1995-05-29 | |
| Grunningen | Innlandet, Norway | 1 | 1 | 0 | 2012-09-20 | |
| Grytebekken | Agder, Norway | 14 | 1 | 0 | 1997-09-23 | |
| Gullerudelva | Innlandet, Norway | 1 | 1 | 0 | 1994-05-24 | |
| Gulskogen Gård | Buskerud, Norway | 1 | 1 | 0 | 2013-09-27 | |
| Hammervatnet | Trøndelag, Norway | 3 | 1 | 0 | 1993-05-25 | |
| Harestuvannet | Akershus, Norway | 1 | 1 | 0 | 2016-06-06 | |
| Harestuvannet | Akershus, Norway | 10 | 5 | 0 | 2004-09-01 | |
| Hattlestadbekken | Møre og Romsdal, Norway | 5 | 1 | 0 | 1998-06-03 | |
| Haukelandsvatnet | Vestland, Norway | 2 | 2 | 0 | 2004-10-14 | |
| Haukvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2013-05-29 | |
| Haukvatnet | Trøndelag, Norway | 2 | 2 | 0 | 1989-09-22 | |
| Hauskjevatnet | Rogaland, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Havågsvatnet | Møre og Romsdal, Norway | 2 | 1 | 0 | 1995-05-24 | |
| Hegglandsvatnet | Vestland, Norway | 2 | 2 | 0 | 1993-06-02 | |
| Hellandsåna | Rogaland, Norway | 4 | 1 | 0 | 1995-05-23 | |
| Hestsjøen | Trøndelag, Norway | 1 | 1 | 0 | 2003-05-14 | |
| Hjørungdalsvatnet | Møre og Romsdal, Norway | 6 | 2 | 0 | 1993-06-11 | |
| Holmavatnet | Vestland, Norway | 2 | 2 | 0 | 2006-05-09 | |
| Holmavatnet | Vestland, Norway | 1 | 1 | 0 | 2006-05-09 | |
| Holterengabekken | Østfold, Norway | 1 | 1 | 0 | 1995-09-25 | |
| Holvikelva | Vestland, Norway | 1 | 1 | 0 | 1994-06-10 | |
| Homevannsbekken | Agder, Norway | 1 | 1 | 0 | 1993-10-27 | |
| Hovet | Telemark, Norway | 1 | 1 | 0 | 1993-10-05 | |
| Hugla-elvo | Vestland, Norway | 4 | 1 | 0 | 1995-06-14 | |
| Hugubekken | Innlandet, Norway | 1 | 1 | 0 | 1993-10-11 | |
| Husavatnet | Vestland, Norway | 3 | 1 | 0 | 1993-06-04 | |
| Hustredalsbekken | Vestland, Norway | 2 | 1 | 0 | 1995-06-01 | |
| Hyllibekken | Østfold, Norway | 1 | 1 | 0 | 2013-09-13 | |
| Høylandsåna | Rogaland, Norway | 1 | 1 | 0 | 1997-09-07 | |
| Igeltjønna | Trøndelag, Norway | 1 | 1 | 0 | 2009-09-08 | |
| Iglevannet | Vestland, Norway | 1 | 1 | 0 | 2009-11-25 | |
| Illestadvatnet | Vestfold, Norway | 2 | 1 | 0 | 2002-08-27 | |
| Innerstrøksneselva | Nordland, Norway | 1 | 1 | 0 | 1994-06-16 | |
| Isielva 2 | Akershus, Norway | 2 | 1 | 0 | 2008-10-22 | |
| Jaren skole | Innlandet, Norway | 1 | 1 | 0 | 2013-09-27 | |
| Jarenvannet | Innlandet, Norway | 5 | 4 | 0 | 1992-09-17 | |
| Jordfallbekken | Vestfold, Norway | 1 | 1 | 0 | 1994-06-10 | |
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