Wrexham — county
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,121
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,083
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,037
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,013
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,005
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,002
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,999
- Group
- Stoneflies
- Peak month
- September
- Records since 2000
- 1,953
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,848
- Group
- Mayflies
- Peak month
- May
- Records since 2000
- 1,718
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 1,516
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,505
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,396
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,226
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,219
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,219
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 1,160
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,067
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,026
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 779
- Group
- Seaweeds and algae
- Peak month
- October
- Records since 2000
- 756
- Group
- True flies
- Peak month
- April
- Records since 2000
- 672
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 626
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 483
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 473
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 337