Species: Buttstrandsnegl (Littorina obtusata)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Drøbak | Akershus, Norway | 1 | 1 | 0 | 2004-05-04 | |
| Drøbak | Akershus, Norway | 2 | 1 | 0 | 2014-10-15 | |
| Englan | Nordland, Norway | 2 | 1 | 0 | 1997-04-11 | |
| Fagerheimsbukta | Trøndelag, Norway | 1 | 1 | 0 | 2007-05-22 | |
| Fannestrandveien 98 | Møre og Romsdal, Norway | 2 | 1 | 0 | 2020-08-28 | |
| Herdla | Vestland, Norway | 1 | 1 | 0 | 2007-06-19 | |
| Hvervenbukta | Oslo, Norway | 1 | 1 | 0 | 2015-09-10 | |
| Håkonshella | Vestland, Norway | 4 | 1 | 2 | 2018-10-01 | |
| Håkonshella | Vestland, Norway | 1 | 1 | 0 | 2020-06-08 | |
| Håkonshellapollen | Vestland, Norway | 1 | 1 | 0 | 2014-06-02 | |
| Jomfruland | Telemark, Norway | 1 | 1 | 1 | 2013-05-07 | |
| Kringstadbukta | Møre og Romsdal, Norway | 1 | 1 | 1 | 2022-05-31 | |
| Langnes | Troms, Norway | 1 | 1 | 2 | 2013-04-17 | |
| Lund-Klungset | Nordland, Norway | 1 | 1 | 1 | 2014-05-29 | |
| Marinbiologisk stasjon, Espegrend | Vestland, Norway | 1 | 1 | 0 | 2016-10-20 | |
| Rolfsbukta, Fornebu | Akershus, Norway | 1 | 1 | 0 | 2010-08-25 | |
| Sageneset | Vestland, Norway | 6 | 1 | 0 | 2003-09-15 | |
| Stokmarknes, Vesterålen | Nordland, Norway | 1 | 1 | 1 | 2014-09-22 | |
| Torvangerfjæra | Vestland, Norway | 1 | 1 | 0 | 2002-10-08 | |
| Træ | Vestland, Norway | 1 | 1 | 0 | 2002-11-07 |