Order: Ostreoida
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Drøbak | Akershus, Norway | 1 | 1 | 1 | 2014-04-22 | |
| Håkonshella | Vestland, Norway | 1 | 1 | 0 | 2012-09-28 |
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