Klasse: Bivalve mollusc (Bivalvia)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Grovfjord | Troms, Norway | 125 | 9 | 7 | 2019-11-04 | |
| Grunningen | Innlandet, Norway | 1 | 1 | 0 | 2012-09-20 | |
| Gryta | Møre og Romsdal, Norway | 4 | 3 | 0 | 1998-05-05 | |
| Grytebekken | Agder, Norway | 28 | 2 | 0 | 1997-09-23 | |
| Grønskjæret | Vestland, Norway | 4 | 1 | 0 | 2019-05-28 | |
| Gullerudelva | Innlandet, Norway | 2 | 2 | 0 | 1994-05-24 | |
| Gullerudtjern | Buskerud, Norway | 1 | 1 | 0 | 1989-09-13 | |
| Gunnesdal/Bjørnrå | Troms, Norway | 21 | 4 | 0 | 1993-09-27 | |
| Guriskj. | Vestfold, Norway | 122 | 6 | 0 | 1998-10-06 | |
| Haddal | Møre og Romsdal, Norway | 39 | 7 | 0 | 1997-09-26 | |
| Hafrsfjord | Rogaland, Norway | 233 | 6 | 0 | 1998-09-28 | |
| Hagland | Nordland, Norway | 16 | 6 | 0 | 1996-10-03 | |
| Hallatjern. | Innlandet, Norway | 1 | 1 | 1 | 2013-09-04 | |
| Halsnøy | Vestland, Norway | 114 | 6 | 0 | 1996-09-25 | |
| Halsnøy kloster | Vestland, Norway | 2 | 2 | 0 | 2019-05-23 | |
| Halsnøy Kloster | Vestland, Norway | 1 | 1 | 0 | 2019-05-23 | |
| Halsnøy Kloster | Vestland, Norway | 2 | 2 | 0 | 2019-05-23 | |
| halsnøy kloster | Vestland, Norway | 3 | 3 | 0 | 2019-05-23 | |
| Halten | Trøndelag, Norway | 7 | 7 | 0 | 1994-06-03 | |
| Hammervatnet | Trøndelag, Norway | 7 | 1 | 0 | 1996-10-17 | |
| Hamn, badeplassen | Vestland, Norway | 6 | 3 | 0 | 2014-05-20 | |
| Handelslagsfjæro | Vestland, Norway | 15 | 2 | 0 | 2016-09-07 | |
| Hansbakkfjæra | Trøndelag, Norway | 30 | 10 | 0 | 2018-05-24 | |
| Hanøy | Vestland, Norway | 40 | 4 | 0 | 1995-10-11 | |
| Haram | Møre og Romsdal, Norway | 39 | 5 | 0 | 1995-10-17 | |
| Haramsøy | Møre og Romsdal, Norway | 47 | 4 | 0 | 1994-11-04 | |
| Harøy | Møre og Romsdal, Norway | 140 | 6 | 0 | 1998-10-30 | |
| Hauknesfjæra | Nordland, Norway | 10 | 5 | 0 | 2016-09-19 | |
| Haukåselva | Vestland, Norway | 2 | 2 | 2 | 2016-05-04 | |
| Hauskjevatnet | Rogaland, Norway | 1 | 1 | 0 | 1990-05-28 | |
| Havågsvatnet | Møre og Romsdal, Norway | 4 | 2 | 0 | 1995-05-24 | |
| Heissa | Møre og Romsdal, Norway | 10 | 3 | 0 | 1995-10-27 | |
| Helgeroafjorden | Vestfold, Norway | 12 | 4 | 0 | 1993-12-08 | |
| Hellandsjøen | Trøndelag, Norway | 25 | 6 | 0 | 1996-09-06 | |
| Hellandsåna | Rogaland, Norway | 6 | 2 | 0 | 1995-05-23 | |
| Hellestø/Sele | Rogaland, Norway | 1 | 1 | 0 | 1998-10-01 | |
| Helleøya | Agder, Norway | 8 | 1 | 0 | 1993-10-21 | |
| Helsetvatnet | Møre og Romsdal, Norway | 2 | 1 | 0 | 2004-09-06 | |
| Herdla | Vestland, Norway | 75 | 6 | 0 | 1995-10-06 | |
| Herdla | Vestland, Norway | 12 | 6 | 0 | 2008-06-17 | |
| Hestvika | Trøndelag, Norway | 29 | 4 | 0 | 1995-01-02 | |
| Hetland | Rogaland, Norway | 14 | 5 | 0 | 1996-10-03 | |
| Hetlevik | Vestland, Norway | 34 | 4 | 0 | 1995-10-13 | |
| Hetlevikstraumen | Vestland, Norway | 12 | 4 | 0 | 2022-09-28 | |
| Hisøy | Agder, Norway | 120 | 6 | 0 | 1997-10-02 | |
| Hjelset | Møre og Romsdal, Norway | 22 | 4 | 0 | 1993-09-23 | |
| Hjørungavåg | Møre og Romsdal, Norway | 4 | 1 | 0 | 1993-11-08 | |
| Hjørungdalsvatnet | Møre og Romsdal, Norway | 3 | 1 | 0 | 1993-06-11 | |
| Hodne/Reve (Bore) | Rogaland, Norway | 8 | 3 | 0 | 1993-09-01 | |
| Hofles | Trøndelag, Norway | 6 | 4 | 0 | 1994-10-04 | |
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