Species: O-skjell (Modiolus modiolus)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Gunnesdal/Bjørnrå | Troms, Norway | 7 | 1 | 0 | 1993-09-27 | |
| Guriskj. | Vestfold, Norway | 21 | 1 | 0 | 1998-10-06 | |
| Haddal | Møre og Romsdal, Norway | 7 | 1 | 0 | 1997-09-26 | |
| Hafrsfjord | Rogaland, Norway | 59 | 1 | 0 | 1998-09-28 | |
| Hagland | Nordland, Norway | 4 | 1 | 0 | 1996-10-03 | |
| Halsnøy | Vestland, Norway | 28 | 1 | 0 | 1996-09-25 | |
| Hamn, badeplassen | Vestland, Norway | 1 | 1 | 0 | 2014-05-20 | |
| Hanøy | Vestland, Norway | 8 | 1 | 0 | 1995-10-11 | |
| Haram | Møre og Romsdal, Norway | 13 | 1 | 0 | 1995-10-17 | |
| Haramsøy | Møre og Romsdal, Norway | 5 | 1 | 0 | 1994-11-04 | |
| Harøy | Møre og Romsdal, Norway | 25 | 1 | 0 | 1998-10-30 | |
| Hauknesfjæra | Nordland, Norway | 3 | 1 | 0 | 2016-09-19 | |
| Heissa | Møre og Romsdal, Norway | 1 | 1 | 0 | 1995-10-27 | |
| Hellandsjøen | Trøndelag, Norway | 5 | 1 | 0 | 1996-09-06 | |
| Herdla | Vestland, Norway | 20 | 1 | 0 | 1995-10-06 | |
| Herdla | Vestland, Norway | 3 | 1 | 0 | 2008-06-17 | |
| Hestvika | Trøndelag, Norway | 3 | 1 | 0 | 1995-01-02 | |
| Hetland | Rogaland, Norway | 1 | 1 | 0 | 1995-09-28 | |
| Hetlevik | Vestland, Norway | 6 | 1 | 0 | 1995-10-13 | |
| Hetlevikstraumen | Vestland, Norway | 1 | 1 | 0 | 2022-09-28 | |
| Hisøy | Agder, Norway | 19 | 1 | 0 | 1997-10-02 | |
| Hjelset | Møre og Romsdal, Norway | 3 | 1 | 0 | 1993-09-23 | |
| Hofles | Trøndelag, Norway | 2 | 1 | 0 | 1994-10-04 | |
| Holm | Nordland, Norway | 2 | 1 | 0 | 1994-11-29 | |
| Holmestrand | Vestfold, Norway | 20 | 1 | 0 | 1996-09-20 | |
| Holtefjell | Vestfold, Norway | 25 | 1 | 0 | 1998-09-24 | |
| Horten | Vestfold, Norway | 79 | 1 | 0 | 1998-10-08 | |
| Hosteland | Vestland, Norway | 2 | 1 | 0 | 1994-09-01 | |
| Hovedøya | Oslo, Norway | 1 | 1 | 0 | 1996-10-16 | |
| Hundvåg | Rogaland, Norway | 25 | 1 | 0 | 1997-10-14 | |
| Hundvåg | Rogaland, Norway | 30 | 1 | 0 | 1999-10-18 | |
| Hvasser | Vestfold, Norway | 1 | 1 | 0 | 1993-10-14 | |
| Hvasser | Vestfold, Norway | 9 | 1 | 0 | 1994-11-30 | |
| håkonshella | Vestland, Norway | 3 | 1 | 1 | 2019-06-13 | |
| Håkonshella | Vestland, Norway | 7 | 1 | 1 | 2017-05-15 | |
| Håkonshellapollen | Vestland, Norway | 9 | 1 | 4 | 2020-06-12 | |
| Håkvik | Nordland, Norway | 13 | 1 | 0 | 2019-04-24 | |
| Hårkollen | Vestfold, Norway | 25 | 1 | 0 | 1998-09-24 | |
| Håøya | Agder, Norway | 3 | 1 | 0 | 1994-11-04 | |
| Ilene | Vestfold, Norway | 14 | 1 | 0 | 1996-09-26 | |
| Ilsvåg | Rogaland, Norway | 2 | 1 | 0 | 1994-11-28 | |
| Inderøy | Nordland, Norway | 1 | 1 | 0 | 1994-11-28 | |
| Indre Lafjord | Agder, Norway | 33 | 1 | 0 | 1995-09-27 | |
| Indrehavn | Vestfold, Norway | 1 | 1 | 0 | 1993-11-29 | |
| Inndyr | Nordland, Norway | 17 | 1 | 0 | 1998-09-28 | |
| Inndyr | Nordland, Norway | 2 | 1 | 0 | 1993-10-04 | |
| Innsmøla | Møre og Romsdal, Norway | 12 | 1 | 0 | 1996-09-19 | |
| Innvik | Vestland, Norway | 1 | 1 | 0 | 1993-10-22 | |
| Jansvik | Nordland, Norway | 5 | 1 | 0 | 1994-11-29 | |
| Jerkholmen | Agder, Norway | 8 | 1 | 0 | 1996-09-19 | |
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