Ephemeroptera
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Torstaddammen | Akershus, Norway | 1 | 1 | 0 | 2013-09-11 | |
| Torvikelva | Møre og Romsdal, Norway | 9 | 3 | 0 | 1994-11-09 | |
| Totlandselven | Vestland, Norway | 1 | 1 | 0 | 2002-04-16 | |
| Tovegstjørn, Bolstadhaugen | Vestland, Norway | 1 | 1 | 1 | 2015-11-15 | |
| Tranevatnet | Vestland, Norway | 2 | 1 | 0 | 2007-05-29 | |
| Tretjønnet | Agder, Norway | 2 | 2 | 0 | 1989-09-27 | |
| Trytetjønnet | Buskerud, Norway | 1 | 1 | 0 | 1990-09-26 | |
| Tussebekken | Akershus, Norway | 6 | 3 | 0 | 1994-09-05 | |
| Tussvatnet | Nordland, Norway | 5 | 4 | 0 | 1990-06-07 | |
| Tveitavatnet | Vestland, Norway | 7 | 5 | 0 | 1991-05-23 | |
| Tveitevannet | Vestland, Norway | 2 | 1 | 0 | 2005-08-28 | |
| Tveitevannet | Vestland, Norway | 12 | 4 | 0 | 2009-09-15 | |
| Tverrbekken | Innlandet, Norway | 12 | 3 | 0 | 1997-09-18 | |
| Tverrelva | Troms, Norway | 1 | 1 | 0 | 1993-06-02 | |
| Tysseelva | Vestland, Norway | 12 | 3 | 0 | 1997-09-18 | |
| Tysso | Vestland, Norway | 1 | 1 | 0 | 2007-05-11 | |
| Tømmervatnet | Troms, Norway | 1 | 1 | 0 | 1993-09-17 | |
| Unnebergbekken | Østfold, Norway | 22 | 3 | 0 | 1995-05-10 | |
| Urevann | Nordland, Norway | 2 | 2 | 0 | 1993-05-08 | |
| Utistubekken | Trøndelag, Norway | 7 | 3 | 0 | 1995-06-14 | |
| Vangsmjøsa | Innlandet, Norway | 1 | 1 | 0 | 2018-04-18 | |
| Vasslivatnet | Rogaland, Norway | 4 | 4 | 0 | 1992-06-04 | |
| Ved Svinndal kirke | Østfold, Norway | 1 | 1 | 0 | 2013-09-25 | |
| Vendingstjørni | Vestland, Norway | 1 | 1 | 0 | 2008-09-05 | |
| Vendingstjørni | Vestland, Norway | 1 | 1 | 0 | 2008-09-05 | |
| Vikerauntjønna | Trøndelag, Norway | 3 | 3 | 0 | 1990-09-28 | |
| Virikbekken | Vestfold, Norway | 18 | 4 | 0 | 2004-05-10 | |
| Vollsvannet | Trøndelag, Norway | 1 | 1 | 0 | 2014-05-19 | |
| Vollsvatnet | Trøndelag, Norway | 1 | 1 | 0 | 2014-09-01 | |
| Vågdalselva | Troms, Norway | 2 | 2 | 0 | 1995-06-02 | |
| Vålåsjøen | Innlandet, Norway | 4 | 2 | 0 | 1993-06-09 | |
| Øggardselva | Møre og Romsdal, Norway | 3 | 2 | 0 | 1995-05-24 | |
| Ørsjøen | Innlandet, Norway | 2 | 2 | 0 | 1994-06-07 | |
| Østernvannet | Akershus, Norway | 1 | 1 | 0 | 1990-08-28 | |
| Østeråa | Telemark, Norway | 1 | 1 | 0 | 2013-09-26 | |
| Øvre Storfjordvatnet | Nordland, Norway | 3 | 3 | 0 | 1990-06-07 | |
| Øvsttunstemmen | Vestland, Norway | 1 | 1 | 0 | 2013-04-24 | |
| Øygårdsvannet | Agder, Norway | 1 | 1 | 0 | 2015-06-20 | |
| Åletjern | Telemark, Norway | 1 | 1 | 0 | 2000-06-06 | |
| Årnestangen | Akershus, Norway | 1 | 1 | 0 | 2003-06-06 | |
| Åros | Akershus, Norway | 1 | 1 | 0 | 2013-09-19 | |
| Årstadtjødne | Rogaland, Norway | 2 | 2 | 0 | 1994-06-06 | |
| Årungen | Akershus, Norway | 6 | 3 | 0 | 1995-09-18 | |
| Åsen | Telemark, Norway | 1 | 1 | 0 | 2019-05-05 | |
| Åstveitvannet | Vestland, Norway | 2 | 2 | 0 | 1990-09-18 |