Phylum: Annelid worms (Annelida)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Stignavatnet | Vestland, Norway | 1 | 1 | 0 | 2002-04-16 | |
| Stokkavatnet | Rogaland, Norway | 2 | 2 | 0 | 2001-05-07 | |
| Stokkbekken | Trøndelag, Norway | 1 | 1 | 0 | 1994-06-14 | |
| Stokkdalstjønna | Trøndelag, Norway | 1 | 1 | 0 | 2015-06-08 | |
| Stokkedammen | Trøndelag, Norway | 1 | 1 | 0 | 2013-09-12 | |
| Stokmarknes, Vesterålen | Nordland, Norway | 2 | 2 | 2 | 2014-09-23 | |
| Storavatnet | Vestland, Norway | 2 | 2 | 0 | 1990-08-15 | |
| Store Bjørnevatnet | Agder, Norway | 1 | 1 | 0 | 1989-08-30 | |
| Store Nesttunvann | Vestland, Norway | 10 | 6 | 1 | 2013-04-23 | |
| Storebø | Vestland, Norway | 2 | 1 | 0 | 1993-10-20 | |
| Storefoss | Innlandet, Norway | 2 | 2 | 2 | 2010-09-08 | |
| Storeidvatnet | Nordland, Norway | 2 | 2 | 0 | 1998-09-07 | |
| Storelva | Møre og Romsdal, Norway | 2 | 1 | 0 | 1994-09-13 | |
| Storelvi, Fresvik | Vestland, Norway | 1 | 1 | 0 | 2013-04-24 | |
| Storetjørna | Vestland, Norway | 2 | 1 | 0 | 1998-05-20 | |
| Storjord | Nordland, Norway | 39 | 7 | 0 | 2006-06-01 | |
| Storleiret | Trøndelag, Norway | 2 | 1 | 0 | 1995-06-12 | |
| Stortjønna Andås | Nordland, Norway | 1 | 1 | 0 | 2013-09-12 | |
| Storvannet | Nordland, Norway | 3 | 3 | 0 | 1990-09-07 | |
| Storvatnet | Trøndelag, Norway | 2 | 1 | 0 | 2004-09-14 | |
| Storvatnet | Trøndelag, Norway | 2 | 2 | 0 | 2004-08-14 | |
| Storvik | Trøndelag, Norway | 2 | 2 | 0 | 2022-05-23 | |
| Storåna | Rogaland, Norway | 2 | 2 | 0 | 1997-09-08 | |
| Strand | Vestfold, Norway | 3 | 1 | 0 | 1993-10-21 | |
| Strand | Nordland, Norway | 35 | 1 | 0 | 1996-09-16 | |
| Stranda | Møre og Romsdal, Norway | 1 | 1 | 0 | 1993-10-08 | |
| Strandstøa | Rogaland, Norway | 1 | 1 | 0 | 1993-11-22 | |
| Strandvik/vinnes | Vestland, Norway | 5 | 1 | 0 | 1993-12-02 | |
| Straume | Vestland, Norway | 2 | 2 | 0 | 2010-09-22 | |
| Straumen | Nordland, Norway | 23 | 4 | 17 | 2010-09-22 | |
| Strøno | Vestland, Norway | 4 | 1 | 0 | 1996-09-18 | |
| Stølen | Vestland, Norway | 6 | 3 | 4 | 2010-09-30 | |
| Støre/Eigerøy | Rogaland, Norway | 6 | 1 | 0 | 2023-09-26 | |
| Støtt | Nordland, Norway | 8 | 1 | 0 | 1996-09-20 | |
| Sula | Trøndelag, Norway | 3 | 1 | 0 | 1997-10-12 | |
| Sundøy | Nordland, Norway | 1 | 1 | 0 | 1993-10-26 | |
| Sunnheia | Agder, Norway | 1 | 1 | 0 | 2010-10-08 | |
| Svadberg | Rogaland, Norway | 3 | 3 | 2 | 2010-09-17 | |
| Svanevatnet | Rogaland, Norway | 4 | 2 | 0 | 1993-05-26 | |
| Svartaholtjørnet | Vestland, Norway | 3 | 2 | 0 | 1992-05-19 | |
| Svartåstjern | Buskerud, Norway | 2 | 1 | 0 | 1993-06-03 | |
| Sveggøya | Møre og Romsdal, Norway | 15 | 1 | 0 | 1997-10-07 | |
| Svelvik | Buskerud, Norway | 14 | 1 | 0 | 1995-10-09 | |
| Svenåa | Akershus, Norway | 6 | 2 | 0 | 1997-05-28 | |
| Svinna | Østfold, Norway | 2 | 2 | 0 | 1994-06-24 | |
| Svinndal | Østfold, Norway | 11 | 6 | 10 | 2010-09-28 | |
| Sylling | Buskerud, Norway | 2 | 1 | 2 | 2010-09-22 | |
| Syvdefjorden | Møre og Romsdal, Norway | 19 | 1 | 0 | 1997-10-09 | |
| Syvdefjorden | Møre og Romsdal, Norway | 10 | 1 | 0 | 1997-10-09 | |
| Sæbø | Møre og Romsdal, Norway | 12 | 3 | 0 | 2004-10-22 | |
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