Great snail-leech
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 1,516
Biocular leech
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 606
Theromyzon tessulatum
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 208
Alboglossiphonia heteroclita
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 105