Early Needle Fly
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 1,872
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- Species by county
- Denbighshire
Species recorded in Denbighshire
264 species
Denbighshire — county
Navicula cryptotenella
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,848
Common February Red
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 1,846
Hazel dormouse
- Group
- Mammals
- Peak month
- October
- Records since 2000
- 1,733
Alainites muticus
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 1,727
Fragilaria gracilis
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,679
Diplectrona felix
- Group
- Caddisflies
- Peak month
- June
- Records since 2000
- 1,523
Great snail-leech
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 1,516
Cocconeis lineata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,505
Scarce Small Yellow Sally
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 1,468
Navicula tripunctata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,396
Ecclisopteryx dalecarlica
- Group
- Caddisflies
- Peak month
- October
- Records since 2000
- 1,349
Navicula cryptocephala
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,248
Surirella brebissonii
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,226
Gomphonema olivaceoides
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,219
Nitzschia paleacea
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,219
Meridion circulare
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,162
Large Brook Dun
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 1,160
Cocconeis pediculus
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,067
Gomphonema olivaceum
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,026
Nitzschia inconspicua
- Group
- Seaweeds and algae
- Peak month
- October
- Records since 2000
- 756
Amphora atomus
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 626
Nitzschia capitellata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 448
Nitzschia pusilla
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 380