Genus: Ostrea
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|
| Agderkysten | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Agderkysten | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Arendal kommune | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Bekkevika | Vestfold, Norway | 3 | 1 | 0 | 2014-09-16 | |
| Espegrend | Vestland, Norway | 1 | 1 | 0 | 2001-01-24 | |
| Håkonshella | Vestland, Norway | 2 | 1 | 0 | 2020-06-11 | |
| Håkonshella | Vestland, Norway | 5 | 1 | 3 | 2016-09-23 | |
| håkonshella | Vestland, Norway | 1 | 1 | 0 | 2018-06-06 | |
| Håkonshellapollen | Vestland, Norway | 3 | 1 | 3 | 2017-05-31 | |
| Jomfruland | Telemark, Norway | 2 | 1 | 2 | 2013-05-14 | |
| Jonstø | Rogaland, Norway | 1 | 1 | 1 | 2010-12-29 | |
| Lille Groos | Agder, Norway | 1 | 1 | 1 | 2013-05-13 | |
| pollen | Vestland, Norway | 3 | 1 | 2 | 2019-06-13 | |
| Risør til Hisøya | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| V. Måsane | Akershus, Norway | 16 | 1 | 0 | 1996-10-08 | |
| Vignesvågen | Rogaland, Norway | 1 | 1 | 0 | 2010-12-29 | |
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