Subclass: Igler (Hirudinea)
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2021 | 2 | 1 | 1 | 2 |
| 2020 | 2 | 2 | 2 | 2 |
| 2019 | 1 | 1 | 1 | 1 |
| 2018 | 1 | 1 | 1 | 1 |
| 2017 | 1 | 3 | 3 | 3 |
| 2016 | 1 | 5 | 5 | 7 |
| 2015 | 3 | 13 | 11 | 46 |
| 2014 | 5 | 9 | 9 | 15 |
| 2013 | 7 | 24 | 24 | 69 |
| 2012 | 3 | 6 | 8 | 11 |
| 2011 | 4 | 3 | 3 | 4 |
| 2010 | 1 | 2 | 2 | 2 |
| 2009 | 3 | 8 | 7 | 15 |
| 2008 | 4 | 6 | 5 | 20 |
| 2007 | 2 | 8 | 8 | 9 |
| 2006 | 2 | 7 | 7 | 10 |
| 2005 | 3 | 10 | 11 | 15 |
| 2004 | 5 | 10 | 8 | 14 |
| 2003 | 3 | 6 | 6 | 6 |
| 2002 | 3 | 4 | 4 | 6 |
| 2001 | 3 | 7 | 7 | 7 |
| 2000 | 1 | 5 | 5 | 5 |
| 1999 | 2 | 2 | 2 | 2 |
| 1998 | 3 | 7 | 7 | 17 |
| 1997 | 1 | 17 | 16 | 44 |
| 1996 | 1 | 20 | 19 | 47 |
| 1995 | 1 | 31 | 28 | 70 |
| 1994 | 1 | 43 | 39 | 80 |
| 1993 | 5 | 32 | 29 | 46 |
| 1992 | 5 | 26 | 28 | 42 |
| 1991 | 5 | 17 | 18 | 42 |
| 1990 | 5 | 27 | 27 | 50 |
| 1989 | 5 | 34 | 34 | 52 |
| Totalt alle år | 9 | 259 | 234 | 762 |