| Hydra sp. | | 12.06.1992 | 12.06.1992 | Harestuvannet (Lunner, Akershus) |
| Hydra sp. | | 27.08.1991 | 27.08.1991 | Jarenvannet (Gran, Innlandet) |
| Hydra sp. | | 25.10.1990 | 25.10.1990 | Moensvatnet (Voss, Vestland) |
| Hydra sp. | | 07.11.1989 | 07.11.1989 | Moensvatnet (Voss, Vestland) |
| Hydra sp. | | 08.10.1989 | 08.10.1989 | Hammervatnet (Levanger, Trøndelag) |
| Hydra sp. | | 28.09.1989 | 28.09.1989 | Husavatnet (Osterøy, Vestland) |
| Hydra sp. | | 27.09.1989 | 27.09.1989 | Vikerauntjønna (Trondheim - Tråante, Trøndelag) |
| Hydra sp. | | 20.09.1989 | 20.09.1989 | Årungen (Ås, Akershus) |
| Hydra sp. | | 20.09.1989 | 20.09.1989 | Sagtjernet (Elverum, Innlandet) |
| Hydra sp. | | 14.09.1989 | 14.09.1989 | Myravatnet (Bergen, Vestland) |
| Hydra sp. | | 14.09.1989 | 14.09.1989 | Hostadvatnet (Hustadvika, Møre og Romsdal) |
| Hydra sp. | | 14.09.1989 | 14.09.1989 | Kvitblikkvannet (Fauske - Fuosko, Nordland) |
| Hydra sp. | | 01.09.1989 | 01.09.1989 | Kolbjørnviksjøen (Marker, Østfold) |
| Hydra sp. | | 28.08.1989 | 28.08.1989 | Arkavatnet (Haugesund, Rogaland) |