Species: Sea oak (Halidrys siliquosa)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Amdam | Møre og Romsdal, Norway | 1 | 1 | 0 | 2000-09-22 | |
| Eidsvika | Vestland, Norway | 1 | 1 | 0 | 2003-05-15 | |
| Englan | Nordland, Norway | 2 | 1 | 0 | 1997-04-11 | |
| Espegrend | Vestland, Norway | 1 | 1 | 1 | 2014-04-07 | |
| Finnfjordbotn, Trollbergan | Troms, Norway | 1 | 1 | 0 | 2013-08-28 | |
| Fjæra på Skjelnan | Troms, Norway | 2 | 1 | 0 | 2008-06-13 | |
| Gandsfjord vest | Rogaland, Norway | 1 | 1 | 0 | 2000-05-09 | |
| Håkonshella | Vestland, Norway | 5 | 1 | 2 | 2017-09-21 | |
| Korsvik | Vestfold, Norway | 1 | 1 | 0 | 2014-09-01 | |
| Sageneset | Vestland, Norway | 5 | 1 | 0 | 2003-09-15 | |
| Sæbø | Møre og Romsdal, Norway | 6 | 1 | 0 | 2004-10-22 |