Species: Piggkorstroll (Marthasterias glacialis)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Bekkevika | Vestfold, Norway | 1 | 1 | 0 | 2014-09-16 | |
| Drøbak | Akershus, Norway | 6 | 1 | 4 | 2016-10-23 | |
| Dusavik | Rogaland, Norway | 1 | 1 | 0 | 2022-06-10 | |
| Espegrend | Vestland, Norway | 1 | 1 | 1 | 2014-04-07 | |
| foldnes | Vestland, Norway | 1 | 1 | 0 | 2006-04-21 | |
| Hvervenbukta | Oslo, Norway | 1 | 1 | 0 | 2015-09-10 | |
| Håkonshella | Vestland, Norway | 3 | 1 | 1 | 2018-05-07 | |
| håkonshella | Vestland, Norway | 3 | 1 | 1 | 2019-06-13 | |
| Håkonshella | Vestland, Norway | 6 | 1 | 1 | 2020-06-11 | |
| Håkonshellapollen | Vestland, Norway | 15 | 1 | 8 | 2020-06-11 | |
| Karlsvikodden | Vestfold, Norway | 5 | 1 | 0 | 2007-10-16 | |
| Kloster Halsnøy | Vestland, Norway | 1 | 1 | 0 | 2019-05-23 | |
| Marinbiologisk stasjon, Espegrend | Vestland, Norway | 1 | 1 | 0 | 2016-10-20 | |
| paradisbukta | Agder, Norway | 1 | 1 | 0 | 2021-08-26 | |
| pollen | Vestland, Norway | 14 | 1 | 7 | 2020-06-11 | |
| Rotvoll/Leangen fjæra | Trøndelag, Norway | 1 | 1 | 1 | 2019-08-21 | |
| Skattval | Trøndelag, Norway | 1 | 1 | 1 | 2020-06-10 | |
| Tofte | Akershus, Norway | 1 | 1 | 0 | 2020-09-04 | |
| Valen | Vestland, Norway | 5 | 1 | 4 | 2015-08-28 |