Hydraena gracilis
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 4,245
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- Species by county
- Isle of Anglesey
Species recorded in Isle of Anglesey
778 species
Isle of Anglesey — county
Sea Aster
- Group
- Flowering plants
- Peak month
- October
- Records since 2000
- 4,057
Roseate Tern
- Group
- Birds
- Peak month
- July
- Records since 2000
- 4,046
Sigara dorsalis
- Group
- True bugs
- Peak month
- September
- Records since 2000
- 4,037
Marsh Pennywort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 4,010
Common Valerian
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 3,992
Green leafhopper
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 3,954
Bloody Crane's-bill
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,916
Helophorus brevipalpis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 3,891
Ingrailed Clay
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 3,879
Marsh Violet
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,858
Common Stork's-bill
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 3,834
Common Yellow Sally
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 3,775
Garden Chafer
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 3,758
Common Groundhopper
- Group
- Grasshoppers and crickets
- Peak month
- August
- Records since 2000
- 3,753
Water Screw-moss
- Group
- Mosses
- Peak month
- January
- Records since 2000
- 3,728
Hydroporus palustris
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 3,690
Snipe fly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 3,679
Common Beet
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,628
Velvet Bent
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 3,598
Marsh Willowherb
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 3,567
Water measurer
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 3,544
Water Horsetail
- Group
- Ferns and horsetails
- Peak month
- July
- Records since 2000
- 3,492
Rambling Tail-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 3,488
Sea campion
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 3,472
Southern String Grimmia
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 3,451
Navelwort
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,375
Urban bluebottle blowfly, European blowfly
- Group
- True flies
- Peak month
- April
- Records since 2000
- 3,361
Pellitory-of-the-wall
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 3,346
Bog-myrtle
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 3,321
Estuary ragworm
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 3,299
Blue-winged Olive
- Group
- Mayflies
- Peak month
- September
- Records since 2000
- 3,275
Water hog lice/slaters
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 3,172
Red Marsh Ladybird
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 3,168
Sea-kale
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 3,139
Navicula gregaria
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 3,118
Water Scorpion, Water bug
- Group
- True bugs
- Peak month
- September
- Records since 2000
- 3,101
Bogbean
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 3,067
Olive Beard Moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 3,036
Larger Noterus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,920
Marsh Cinquefoil
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,914
Gomphonema parvulum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,885
Reimeria sinuata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,874
Navicula lanceolata
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 2,789
Marsh Horsetail
- Group
- Ferns and horsetails
- Peak month
- June
- Records since 2000
- 2,785
Cocconeis placentula
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,767
Crumb-of-bread sponge
- Group
- Sponges
- Peak month
- September
- Records since 2000
- 2,758
Hesperocorixa sahlbergi
- Group
- True bugs
- Peak month
- October
- Records since 2000
- 2,758