Species: Storstrandsnegl (Littorina littorea)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Agderkysten | Agder, Norway | 1 | 1 | 1 | 2013-03-20 | |
| Arendal | Agder, Norway | 3 | 1 | 3 | 2014-05-07 | |
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Arendal | Agder, Norway | 1 | 1 | 0 | 2013-03-20 | |
| Bekkevika | Vestfold, Norway | 2 | 1 | 0 | 2014-09-16 | |
| Bjellandstrand | Agder, Norway | 2 | 1 | 1 | 2017-10-20 | |
| Drøbak | Akershus, Norway | 1 | 1 | 0 | 2004-05-04 | |
| Drøbak | Akershus, Norway | 2 | 1 | 1 | 2016-10-23 | |
| Dvergsnestangen | Agder, Norway | 1 | 1 | 0 | 2016-07-15 | |
| dybdal | Agder, Norway | 2 | 1 | 2 | 2014-05-07 | |
| dybdal stranda | Agder, Norway | 2 | 1 | 2 | 2017-10-25 | |
| Espegrend | Vestland, Norway | 2 | 1 | 0 | 2001-01-31 | |
| Espegrend | Vestland, Norway | 1 | 1 | 1 | 2014-04-07 | |
| Fagerheimsbukta | Trøndelag, Norway | 1 | 1 | 0 | 2007-05-22 | |
| Finnfjordbotn, Trollbergan | Troms, Norway | 2 | 1 | 0 | 2013-08-28 | |
| Flakstad | Nordland, Norway | 2 | 1 | 0 | 1997-10-15 | |
| foldnes | Vestland, Norway | 2 | 1 | 0 | 2006-04-21 | |
| Grefstadvika | Agder, Norway | 2 | 1 | 2 | 2014-09-04 | |
| Grovfjord | Troms, Norway | 1 | 1 | 0 | 2003-09-18 | |
| Hamn, badeplassen | Vestland, Norway | 1 | 1 | 0 | 2014-05-06 | |
| Herdla | Vestland, Norway | 2 | 1 | 0 | 2008-06-17 | |
| Håkonshella | Vestland, Norway | 2 | 1 | 2 | 2015-09-30 | |
| Håkonshella - Pollen | Vestland, Norway | 1 | 1 | 1 | 2013-08-15 | |
| Jomfruland | Telemark, Norway | 2 | 1 | 2 | 2013-05-14 | |
| Karlsvikodden | Vestfold, Norway | 1 | 1 | 0 | 2008-04-22 | |
| Klippfiskberget | Troms, Norway | 2 | 1 | 0 | 2013-05-23 | |
| Kårtveitpollen | Vestland, Norway | 3 | 1 | 2 | 2014-09-30 | |
| Mjølvik | Troms, Norway | 2 | 1 | 2 | 2014-08-28 | |
| Mjølvik Hardbunn | Troms, Norway | 1 | 1 | 1 | 2014-08-28 | |
| Mjølvik, bløtbunn | Troms, Norway | 1 | 1 | 0 | 2014-08-29 | |
| Mørkvedbukta, Fjæra | Nordland, Norway | 1 | 1 | 0 | 2014-10-09 | |
| Nesna | Nordland, Norway | 1 | 1 | 0 | 1997-10-07 | |
| Nordåsvannet | Vestland, Norway | 1 | 1 | 0 | 2010-09-22 | |
| Osen | Nordland, Norway | 1 | 1 | 0 | 2010-05-19 | |
| Rolfsbukta, Fornebu | Akershus, Norway | 1 | 1 | 0 | 2010-08-25 | |
| Sageneset | Vestland, Norway | 4 | 1 | 0 | 2003-09-15 | |
| Stokmarknes, Vesterålen | Nordland, Norway | 3 | 1 | 1 | 2014-10-23 | |
| Stornes | Troms, Norway | 1 | 1 | 0 | 2000-09-07 | |
| Straume | Vestland, Norway | 1 | 1 | 0 | 2010-09-22 | |
| Sula | Trøndelag, Norway | 2 | 1 | 0 | 1997-10-02 | |
| Torvangerfjæra | Vestland, Norway | 1 | 1 | 0 | 2002-10-08 | |
| Tranøybotn, Solset | Troms, Norway | 1 | 1 | 0 | 2013-07-10 | |
| Træ | Vestland, Norway | 1 | 1 | 0 | 2002-11-07 | |
| Valen | Vestland, Norway | 3 | 1 | 3 | 2014-06-05 |