Species (sp.): Posthornmark (Spirorbis sp.)
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2022 | 1 | 1 | 1 | 3 |
| 2021 | 1 | 1 | 1 | 3 |
| 2020 | 1 | 5 | 4 | 5 |
| 2019 | 1 | 1 | 1 | 1 |
| 2018 | 1 | 6 | 4 | 6 |
| 2017 | 1 | 2 | 2 | 2 |
| 2016 | 1 | 6 | 6 | 7 |
| 2015 | 1 | 8 | 7 | 16 |
| 2014 | 1 | 5 | 5 | 7 |
| 2013 | 1 | 4 | 4 | 8 |
| 2012 | 1 | 1 | 1 | 2 |
| 2010 | 1 | 2 | 2 | 2 |
| 2006 | 1 | 1 | 1 | 1 |
| 2005 | 1 | 1 | 1 | 3 |
| 2004 | 1 | 1 | 1 | 1 |
| 2003 | 1 | 1 | 1 | 8 |
| 2002 | 1 | 3 | 3 | 3 |
| 2001 | 1 | 3 | 3 | 10 |
| 2000 | 1 | 1 | 1 | 1 |
| 1999 | 1 | 1 | 1 | 1 |
| 1997 | 1 | 1 | 1 | 2 |
| 1994 | 1 | 2 | 2 | 2 |
| Totalt alle år | 1 | 43 | 38 | 94 |