Phylum: Coelenterates (Cnidaria)
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Løgevik | Rogaland, Norway | 1 | 1 | 0 | 1994-12-01 | |
| Løvøya | Vestfold, Norway | 21 | 2 | 0 | 1998-09-17 | |
| Magerøya | Trøndelag, Norway | 17 | 2 | 0 | 1996-10-15 | |
| Malangseidet | Troms, Norway | 3 | 2 | 0 | 1993-11-04 | |
| Manger | Vestland, Norway | 2 | 1 | 0 | 1993-10-18 | |
| Marifjøra | Vestland, Norway | 4 | 2 | 0 | 1996-10-18 | |
| Marikoven | Vestland, Norway | 10 | 2 | 0 | 1994-10-20 | |
| mellom leangenbokta og rotvoll | Trøndelag, Norway | 1 | 1 | 0 | 2019-08-23 | |
| Melsomvik | Vestfold, Norway | 89 | 2 | 0 | 1998-10-06 | |
| Meløy | Nordland, Norway | 17 | 2 | 0 | 1995-09-14 | |
| Mesxy | Finnmark, Norway | 1 | 1 | 0 | 1994-04-08 | |
| Midsund | Møre og Romsdal, Norway | 29 | 2 | 0 | 1996-09-20 | |
| Mindalen | Agder, Norway | 3 | 2 | 0 | 1993-11-02 | |
| Mjølvik Hardbunn | Troms, Norway | 1 | 1 | 2 | 2014-08-28 | |
| Moensvatnet | Vestland, Norway | 2 | 1 | 0 | 1990-10-25 | |
| Monstad | Trøndelag, Norway | 7 | 2 | 0 | 1994-12-05 | |
| Moutmarka | Vestfold, Norway | 18 | 2 | 0 | 1994-11-09 | |
| Munkerekka | Vestfold, Norway | 85 | 2 | 0 | 2001-05-21 | |
| Myklebost | Møre og Romsdal, Norway | 12 | 2 | 0 | 1993-09-24 | |
| Myravatnet | Vestland, Norway | 1 | 1 | 0 | 1989-09-14 | |
| Mærdø | Agder, Norway | 30 | 2 | 0 | 1994-10-26 | |
| Møllebukta, Hafrsfjord | Rogaland, Norway | 47 | 2 | 0 | 1996-10-08 | |
| Mørkvedbukta, Fjæra | Nordland, Norway | 13 | 3 | 2 | 2014-10-09 | |
| Måndalen | Møre og Romsdal, Norway | 8 | 2 | 0 | 1996-10-23 | |
| Narvik | Nordland, Norway | 70 | 2 | 0 | 1998-11-24 | |
| Nattholmen | Vestfold, Norway | 87 | 2 | 0 | 1998-09-17 | |
| Nautnes | Vestland, Norway | 1 | 1 | 1 | 2014-09-17 | |
| Naverfjorden | Vestfold, Norway | 19 | 2 | 0 | 2000-09-26 | |
| Nesna | Nordland, Norway | 2 | 2 | 0 | 1997-09-24 | |
| Nitelva | Akershus, Norway | 1 | 1 | 0 | 2013-09-26 | |
| Nordbø | Rogaland, Norway | 16 | 2 | 0 | 1999-09-29 | |
| Nordnesøy | Nordland, Norway | 16 | 2 | 0 | 1998-09-15 | |
| Nordre Eigerøy | Rogaland, Norway | 12 | 2 | 0 | 1998-06-08 | |
| Nær Vartdal skule | Møre og Romsdal, Norway | 3 | 2 | 0 | 1994-10-03 | |
| Nærbø | Rogaland, Norway | 51 | 2 | 0 | 1996-10-14 | |
| Nærsnes | Akershus, Norway | 2 | 2 | 0 | 1993-12-07 | |
| Oddane sand/Smørbukta | Vestfold, Norway | 73 | 2 | 0 | 1996-09-24 | |
| Oksvoll | Trøndelag, Norway | 18 | 2 | 0 | 1997-10-08 | |
| Olden | Vestland, Norway | 8 | 2 | 0 | 1994-11-03 | |
| Orerønningen | Vestfold, Norway | 3 | 2 | 0 | 1993-11-29 | |
| Ormelet | Vestfold, Norway | 28 | 2 | 0 | 1994-11-09 | |
| Orvika | Møre og Romsdal, Norway | 42 | 2 | 0 | 2002-05-31 | |
| Ottersøy | Trøndelag, Norway | 4 | 2 | 0 | 1995-10-26 | |
| paradisbukta | Agder, Norway | 2 | 2 | 0 | 2021-08-31 | |
| pollen | Vestland, Norway | 22 | 3 | 3 | 2019-06-13 | |
| Pusnes/Tybakken | Agder, Norway | 99 | 2 | 0 | 2005-09-22 | |
| Raknesvågen | Vestland, Norway | 1 | 1 | 0 | 2001-05-27 | |
| Randesund | Agder, Norway | 25 | 2 | 0 | 1994-12-01 | |
| Ranvik | Agder, Norway | 14 | 2 | 0 | 1994-10-18 | |
| Ranvik | Vestfold, Norway | 57 | 2 | 0 | 1996-09-24 |
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