Genus: Keratella
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2018 | 1 | 1 | 1 | 1 |
| 2003 | 1 | 1 | 1 | 1 |
| 1998 | 1 | 1 | 1 | 1 |
| 1997 | 3 | 7 | 6 | 8 |
| 1996 | 2 | 6 | 5 | 8 |
| 1995 | 3 | 2 | 2 | 3 |
| 1994 | 4 | 11 | 11 | 19 |
| 1993 | 2 | 8 | 8 | 9 |
| 1992 | 1 | 2 | 2 | 2 |
| 1991 | 3 | 7 | 6 | 15 |
| 1990 | 4 | 9 | 9 | 20 |
| 1989 | 3 | 16 | 17 | 20 |
| Totalt alle år | 7 | 47 | 41 | 107 |
