Subclass: Igler (Hirudinea)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Jørstadåna | Rogaland, Norway | 1 | 1 | 0 | 1996-05-03 | |
| Jåbekkvannet | Agder, Norway | 2 | 2 | 0 | 1991-06-11 | |
| Kaldbekken | Innlandet, Norway | 1 | 1 | 0 | 1993-10-11 | |
| Kampåa | Akershus, Norway | 6 | 1 | 0 | 1998-06-17 | |
| Karussen | Agder, Norway | 1 | 1 | 0 | 2014-10-22 | |
| Kinntjernet/Erstjernet | Innlandet, Norway | 1 | 1 | 0 | 2018-09-01 | |
| Kjemsjøen | Innlandet, Norway | 2 | 2 | 0 | 1991-09-05 | |
| Kjønndalsbekken | Vestfold, Norway | 14 | 1 | 0 | 1998-09-22 | |
| Klevatn | Nordland, Norway | 1 | 1 | 0 | 1992-09-14 | |
| Klokkarvatnet | Vestland, Norway | 1 | 1 | 0 | 2015-10-27 | |
| Klokktjønna | Trøndelag, Norway | 1 | 1 | 0 | 2004-09-08 | |
| Kloppedalstjernet | Vestland, Norway | 1 | 1 | 0 | 2002-05-29 | |
| Knemsnekken | Buskerud, Norway | 1 | 1 | 0 | 1995-10-17 | |
| Kolbjørnviksjøen | Østfold, Norway | 5 | 3 | 0 | 1993-06-10 | |
| Kolbotnvannet | Akershus, Norway | 3 | 3 | 0 | 2000-05-26 | |
| Kolstadbekken | Østfold, Norway | 2 | 1 | 0 | 1996-04-30 | |
| Koltjønna | Trøndelag, Norway | 3 | 2 | 0 | 1992-08-27 | |
| Korssjøen | Vestfold, Norway | 2 | 1 | 0 | 1992-09-08 | |
| Kristianborgvannet | Vestland, Norway | 1 | 1 | 0 | 2009-06-19 | |
| Kristianborgvannet | Vestland, Norway | 2 | 1 | 0 | 2006-05-11 | |
| Kristianborgvannet | Vestland, Norway | 6 | 2 | 2 | 2015-05-29 | |
| Krussætertjern | Østfold, Norway | 1 | 1 | 0 | 2000-04-12 | |
| Kråkdalbekken | Trøndelag, Norway | 1 | 1 | 0 | 1994-05-03 | |
| Kvassnesstemma | Vestland, Norway | 1 | 1 | 0 | 2001-09-17 | |
| Kvednabekken | Vestland, Norway | 1 | 1 | 0 | 1996-05-02 | |
| Kverndammen | Telemark, Norway | 8 | 2 | 0 | 1991-08-30 | |
| Kvitblikkvannet | Nordland, Norway | 1 | 1 | 0 | 1993-06-03 | |
| Kyvatnet | Trøndelag, Norway | 2 | 1 | 0 | 2002-09-26 | |
| Langavatnet | Vestland, Norway | 2 | 2 | 0 | 1989-08-31 | |
| Langbekken | Trøndelag, Norway | 5 | 1 | 0 | 1995-06-15 | |
| Langevann | Vestland, Norway | 1 | 1 | 0 | 2006-05-23 | |
| Langvannet | Akershus, Norway | 1 | 1 | 0 | 2001-05-28 | |
| Langvatnet, Tromsøya | Troms, Norway | 2 | 2 | 0 | 2014-09-02 | |
| Lauvtjønna | Trøndelag, Norway | 1 | 1 | 0 | 1992-05-26 | |
| Legebekken | Rogaland, Norway | 1 | 1 | 0 | 1995-06-08 | |
| Lianvannet | Trøndelag, Norway | 4 | 3 | 0 | 2021-09-03 | |
| Lianvatnet | Trøndelag, Norway | 2 | 2 | 0 | 1989-09-27 | |
| Liavannet | Vestland, Norway | 1 | 1 | 0 | 2015-06-25 | |
| Liavannet | Vestland, Norway | 1 | 1 | 0 | 2020-06-12 | |
| Lierbekken | Vestland, Norway | 1 | 1 | 0 | 1996-04-30 | |
| Lille luktvann | Nordland, Norway | 2 | 2 | 0 | 1991-09-25 | |
| Lille Lungegårdsvann | Vestland, Norway | 2 | 1 | 0 | 2006-05-02 | |
| Lisjeelva | Møre og Romsdal, Norway | 2 | 1 | 0 | 2001-09-28 | |
| Lisselva | Trøndelag, Norway | 12 | 1 | 0 | 1996-06-11 | |
| Litlvatnet | Trøndelag, Norway | 1 | 1 | 0 | 1999-09-20 | |
| Ljøgodttjern | Akershus, Norway | 5 | 3 | 0 | 1990-05-31 | |
| Lomma | Akershus, Norway | 1 | 1 | 0 | 1997-04-30 | |
| Lommedalselva 1 | Akershus, Norway | 3 | 2 | 0 | 2008-10-23 | |
| Lone | Vestland, Norway | 4 | 1 | 2 | 2015-05-18 | |
| Loneelva | Vestland, Norway | 2 | 1 | 0 | 2005-09-06 | |
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