When it is recorded
Jan0
Feb0
Mar13
Apr309
May245
Jun24
Jul14
Aug2
Sep124
Oct76
Nov23
Dec0
GBIF records by month, 2000–2025 (all years combined).
Where it is recorded
| # | County | Nation | Records | Share |
|---|---|---|---|---|
| 1 | Gwynedd | Wales | 225 | |
| 2 | Powys | Wales | 224 | |
| 3 | Carmarthenshire | Wales | 62 | |
| 4 | Ceredigion | Wales | 49 | |
| 5 | Pembrokeshire | Wales | 39 | |
| 6 | Conwy | Wales | 29 | |
| 7 | Wrexham | Wales | 23 | |
| 8 | Denbighshire | Wales | 18 | |
| 9 | Swansea | Wales | 15 | |
| 10 | Isle of Anglesey | Wales | 8 | |
| 11 | Aberdeenshire | Scotland | 5 | |
| 12 | Monmouthshire | Wales | 4 |
2 England5 Scotland823 Wales
Records per county (GADM level 2) and per nation; one record can count towards several areas. 12 counties in all.
About this species
- Records since 2000
- 830
- Peak month
- April
- Counties with records
- 12
- Group
- Seaweeds and algae
- NBN Atlas records since 2000
- 811
- Most recorded in
- Gwynedd, Powys, Carmarthenshire
- Kingdom
- Chromista
- Phylum
- Ochrophyta
- Class
- Bacillariophyceae
- Order
- Fragilariales
- Family
- Fragilariaceae
- Genus
- Hannaea
- Name with authority
- Hannaea arcus (Ehrenberg) R.M.Patrick, 1966
- Described
- 1966
- Contributing datasets
- 2
Sources: GBIF occurrence data (CC0 / CC BY), JNCC Taxon Designations (OGL), NBN Atlas (open licences), Wikidata (CC0) · Wikidata Q16715518 · GBIF 3192614