Subclass: Igler (Hirudinea)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Skithegga | Akershus, Norway | 1 | 1 | 0 | 2014-08-24 | |
| Skjelbreidvatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Skoltjønna | Nordland, Norway | 1 | 1 | 0 | 2013-09-26 | |
| Skomakerdiket | Vestland, Norway | 7 | 1 | 0 | 2015-11-10 | |
| Skranevatnet | Vestland, Norway | 14 | 2 | 0 | 2013-05-30 | |
| Skutleselvi | Vestland, Norway | 8 | 1 | 0 | 1998-09-18 | |
| Smeneselva | Møre og Romsdal, Norway | 14 | 1 | 0 | 1996-08-27 | |
| Sognsvann | Oslo, Norway | 2 | 2 | 0 | 2005-05-23 | |
| Solheimsvannet | Vestland, Norway | 2 | 2 | 0 | 1998-05-08 | |
| Solheimsvannet | Vestland, Norway | 8 | 3 | 0 | 2015-09-07 | |
| Songebekken | Agder, Norway | 1 | 1 | 0 | 1994-10-15 | |
| Stamtjernbekken | Trøndelag, Norway | 1 | 1 | 0 | 1999-06-07 | |
| Stavsjø | Innlandet, Norway | 16 | 4 | 0 | 1991-10-17 | |
| Steglevannet | Buskerud, Norway | 2 | 2 | 0 | 1989-10-06 | |
| Stensrudtjern | Oslo, Norway | 1 | 1 | 0 | 1989-09-21 | |
| Stidam Øst | Trøndelag, Norway | 1 | 1 | 0 | 2014-05-19 | |
| Stokkavatnet | Rogaland, Norway | 1 | 1 | 0 | 2001-05-07 | |
| Stokkdalstjønna | Trøndelag, Norway | 1 | 1 | 0 | 2015-06-08 | |
| Store Nesttunvann | Vestland, Norway | 4 | 1 | 1 | 2013-04-23 | |
| Storeidvatnet | Nordland, Norway | 1 | 1 | 0 | 1998-09-07 | |
| Storelvi, Fresvik | Vestland, Norway | 1 | 1 | 0 | 2013-04-24 | |
| Storvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Storåna | Rogaland, Norway | 1 | 1 | 0 | 1997-09-08 | |
| Svanevatnet | Rogaland, Norway | 1 | 1 | 0 | 1993-05-26 | |
| Svartaholtjørnet | Vestland, Norway | 1 | 1 | 0 | 1990-05-22 | |
| Svenåa | Akershus, Norway | 2 | 1 | 0 | 1997-05-28 | |
| Svinna | Østfold, Norway | 1 | 1 | 0 | 1994-06-24 | |
| Sætertjern | Akershus, Norway | 1 | 1 | 0 | 1990-09-12 | |
| Søndre Aas gård, Holmlia | Oslo, Norway | 1 | 1 | 0 | 2013-06-17 | |
| Tornesvatnet | Rogaland, Norway | 7 | 4 | 0 | 1990-09-27 | |
| Torvikelva | Møre og Romsdal, Norway | 3 | 1 | 0 | 1994-11-09 | |
| Tranevannet | Vestland, Norway | 1 | 1 | 0 | 2005-08-22 | |
| Tranevatnet | Vestland, Norway | 7 | 2 | 1 | 2016-04-20 | |
| Tretjønnet | Agder, Norway | 2 | 2 | 0 | 1990-06-26 | |
| Tussebekken | Akershus, Norway | 2 | 1 | 0 | 1994-09-05 | |
| Tussvatnet | Nordland, Norway | 3 | 2 | 0 | 1990-06-07 | |
| Tveitavatnet | Vestland, Norway | 1 | 1 | 0 | 1992-10-01 | |
| Tveitevannet | Vestland, Norway | 3 | 1 | 0 | 2008-09-04 | |
| Tveitevannet | Vestland, Norway | 15 | 3 | 0 | 2011-09-09 | |
| Tveitevannet | Vestland, Norway | 1 | 1 | 1 | 2016-06-01 | |
| Tverrbekken | Innlandet, Norway | 4 | 1 | 0 | 1997-09-18 | |
| Tysseelva | Vestland, Norway | 4 | 1 | 0 | 1997-09-18 | |
| Tysso | Vestland, Norway | 1 | 1 | 0 | 2007-05-11 | |
| Unnebergbekken | Østfold, Norway | 9 | 1 | 0 | 1996-09-16 | |
| Utistubekken | Trøndelag, Norway | 4 | 1 | 0 | 1995-06-14 | |
| Vasslivatnet | Rogaland, Norway | 1 | 1 | 0 | 1992-06-04 | |
| vestretjørn | Vestland, Norway | 1 | 1 | 0 | 2004-09-10 | |
| Vikerauntjønna | Trøndelag, Norway | 2 | 2 | 0 | 1992-09-11 | |
| Virikbekken | Vestfold, Norway | 6 | 1 | 0 | 2003-05-14 | |
| Vollane | Vestland, Norway | 1 | 1 | 0 | 2007-05-22 | |
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