Genus: Ceratium
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2015 | 1 | 1 | 1 | 1 |
| 2014 | 1 | 1 | 1 | 2 |
| 2006 | 1 | 1 | 1 | 1 |
| 2003 | 1 | 1 | 1 | 1 |
| 1996 | 1 | 2 | 2 | 2 |
| 1994 | 1 | 6 | 6 | 6 |
| 1993 | 1 | 15 | 16 | 16 |
| 1992 | 1 | 1 | 1 | 1 |
| 1991 | 2 | 10 | 11 | 15 |
| 1990 | 2 | 19 | 20 | 34 |
| 1989 | 1 | 17 | 17 | 17 |
| Totalt alle år | 4 | 43 | 47 | 96 |
