Gwynedd — county
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,729
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 2,727
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 2,725
- Group
- Liverworts
- Peak month
- April
- Records since 2000
- 2,711
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 2,708
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 2,701
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,663
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,661
- Group
- Mosses
- Peak month
- October
- Records since 2000
- 2,655
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 2,645
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 2,643
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,640
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 2,611
- Group
- True flies
- Peak month
- May
- Records since 2000
- 2,611
- Group
- Liverworts
- Peak month
- September
- Records since 2000
- 2,603
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 2,601
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,601
- Group
- Liverworts
- Peak month
- September
- Records since 2000
- 2,598
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 2,582
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 2,581
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,577
- Group
- True flies
- Peak month
- June
- Records since 2000
- 2,572
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 2,553
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,536
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 2,531
- Group
- Fish
- Peak month
- September
- Records since 2000
- 2,526
- Group
- True flies
- Peak month
- August
- Records since 2000
- 2,521
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 2,510
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 2,502
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,494
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 2,491
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 2,485
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 2,462
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 2,461
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,443
- Group
- True flies
- Peak month
- August
- Records since 2000
- 2,435
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 2,433
- Group
- Flowering plants
- Peak month
- October
- Records since 2000
- 2,432
- Group
- Caddisflies
- Peak month
- April
- Records since 2000
- 2,423
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,410
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,409
- Group
- Stoneflies
- Peak month
- September
- Records since 2000
- 2,409
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 2,408
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 2,394
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 2,391
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 2,388
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 2,387
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,374