When it is recorded
Jan1
Feb0
Mar13
Apr6
May17
Jun35
Jul47
Aug19
Sep34
Oct13
Nov9
Dec0
GBIF records by month, 2000–2025 (all years combined).
Where it is recorded
| # | County | Nation | Records | Share |
|---|---|---|---|---|
| 1 | Gwynedd | Wales | 16 | |
| 2 | Isle of Anglesey | Wales | 10 | |
| 3 | Ceredigion | Wales | 9 | |
| 4 | Denbighshire | Wales | 9 | |
| 5 | Cambridgeshire | England | 7 | |
| 6 | Powys | Wales | 7 | |
| 7 | Monmouthshire | Wales | 7 | |
| 8 | Norfolk | England | 6 | |
| 9 | Worcestershire | England | 6 | |
| 10 | Somerset | England | 6 | |
| 11 | Kent | England | 5 | |
| 12 | Dorset | England | 5 | |
| 13 | Nottinghamshire | England | 5 | |
| 14 | North Yorkshire | England | 4 | |
| 15 | Wrexham | Wales | 4 |
68 England10 Scotland121 Wales
Records per county (GADM level 2) and per nation; one record can count towards several areas. 35 counties in all.
About this species
- Records since 2000
- 208
- Peak month
- July
- Counties with records
- 35
- Group
- Worms (annelids)
- NBN Atlas records since 2000
- 280
- Kingdom
- Animalia
- Phylum
- Annelida
- Class
- Clitellata
- Order
- Rhynchobdellida
- Family
- Glossiphoniidae
- Genus
- Theromyzon
- Name with authority
- Theromyzon tessulatum (O.F.Müller, 1773)
- Described
- 1773
Sources: GBIF occurrence data (CC0 / CC BY), JNCC Taxon Designations (OGL), NBN Atlas (open licences), Wikidata (CC0) · Wikidata Q150856 · GBIF 2307911