Subclass: Igler (Hirudinea)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Longvatnet | Rogaland, Norway | 2 | 2 | 0 | 1990-06-01 | |
| Losby besøksgård | Akershus, Norway | 3 | 2 | 0 | 2010-06-22 | |
| Madsvannet | Nordland, Norway | 1 | 1 | 0 | 1990-09-22 | |
| Meitjenn | Telemark, Norway | 1 | 1 | 0 | 2003-09-11 | |
| Mellombekken | Innlandet, Norway | 2 | 1 | 0 | 1995-06-13 | |
| Mildevatnet | Vestland, Norway | 5 | 3 | 0 | 2012-04-26 | |
| Moensvatnet | Vestland, Norway | 2 | 1 | 0 | 1992-10-29 | |
| Molbekktjernet | Østfold, Norway | 2 | 2 | 0 | 1990-09-13 | |
| Mosvatnet | Rogaland, Norway | 3 | 3 | 0 | 2001-06-18 | |
| Murttjernbekken | Østfold, Norway | 6 | 1 | 0 | 1996-10-23 | |
| Myklebustvannet | Møre og Romsdal, Norway | 2 | 1 | 0 | 1991-06-03 | |
| Myravatnet | Vestland, Norway | 1 | 1 | 0 | 2016-05-13 | |
| Myravatnet | Vestland, Norway | 4 | 3 | 0 | 2007-05-03 | |
| Måkkevæjbekken | Finnmark, Norway | 1 | 1 | 0 | 1995-06-21 | |
| Neshalvøya | Vestland, Norway | 2 | 2 | 0 | 2012-04-04 | |
| Nesttun Vassdraget | Vestland, Norway | 3 | 1 | 0 | 2015-08-24 | |
| Nesttunelven | Vestland, Norway | 6 | 1 | 0 | 2013-04-23 | |
| Nesttunvannet | Vestland, Norway | 2 | 2 | 0 | 1991-06-06 | |
| Nitelva | Akershus, Norway | 2 | 1 | 0 | 1997-05-29 | |
| Nitelva | Akershus, Norway | 1 | 1 | 0 | 1996-05-15 | |
| Nord i Skoklefaldtjernet | Akershus, Norway | 1 | 1 | 1 | 2013-09-27 | |
| Norheimsskogen og området rundt skolen | Rogaland, Norway | 1 | 1 | 0 | 2013-08-22 | |
| Nydammen | Trøndelag, Norway | 7 | 1 | 0 | 2015-09-18 | |
| Nykkjavatnet | Rogaland, Norway | 1 | 1 | 1 | 2009-05-30 | |
| Nøklevann | Oslo, Norway | 3 | 2 | 0 | 1992-06-11 | |
| Oftenesbekken | Agder, Norway | 10 | 1 | 0 | 1998-09-24 | |
| Oppsjøbekken | Østfold, Norway | 12 | 1 | 0 | 1997-05-28 | |
| Opsangervatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-25 | |
| Ortunvannet | Vestland, Norway | 3 | 1 | 0 | 2016-04-21 | |
| Ortuvannet | Vestland, Norway | 1 | 1 | 1 | 2014-10-29 | |
| Polljavatnelva | Vestland, Norway | 3 | 1 | 0 | 1993-11-04 | |
| Prestebekken | Agder, Norway | 4 | 1 | 0 | 1994-10-05 | |
| Prestvatn | Agder, Norway | 1 | 1 | 0 | 1992-09-11 | |
| Pytt ved Strand gård | Trøndelag, Norway | 1 | 1 | 0 | 2004-08-14 | |
| Ramdalsbekken | Trøndelag, Norway | 2 | 1 | 0 | 1994-06-15 | |
| Reinsvolldammen | Innlandet, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Rena og omegn | Innlandet, Norway | 1 | 1 | 1 | 2020-06-11 | |
| Rognbekken | Telemark, Norway | 14 | 1 | 0 | 1995-10-04 | |
| Rogåna | Agder, Norway | 4 | 1 | 0 | 1996-10-28 | |
| rosholtkjenna | Agder, Norway | 1 | 1 | 0 | 2005-05-21 | |
| Rossevatn | Rogaland, Norway | 10 | 4 | 0 | 1993-05-25 | |
| Rullestadtjern | Akershus, Norway | 2 | 2 | 0 | 1991-09-19 | |
| Rundvannet | Troms, Norway | 3 | 1 | 0 | 1992-09-03 | |
| Røyvannet | Telemark, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Sagtjernet | Innlandet, Norway | 1 | 1 | 0 | 1992-06-16 | |
| Samdalsvatnet | Vestland, Norway | 1 | 1 | 0 | 2005-08-25 | |
| Semsvannet | Akershus, Norway | 5 | 4 | 0 | 1993-05-26 | |
| Skagetjørna | Vestland, Norway | 1 | 1 | 0 | 2013-06-06 | |
| Skarvatnet | Møre og Romsdal, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Skirstadtjernet | Innlandet, Norway | 1 | 1 | 0 | 2012-09-26 |
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