Slender Ant
- Group
- Bees, wasps and ants
- Records since 2000
- 637
- Scientific name
- Leptothorax acervorum
Pale Sedge
- Group
- Flowering plants
- Records since 2000
- 636
- Scientific name
- Carex pallescens
Helius longirostris
- Group
- True flies
- Records since 2000
- 635
- Peak month
- June
Myrmica sabuleti
- Group
- Bees, wasps and ants
- Records since 2000
- 634
- Peak month
- June
Notiophilus palustris
- Group
- Beetles
- Records since 2000
- 634
- Peak month
- June
Round-leaved Crowfoot
- Group
- Flowering plants
- Records since 2000
- 634
- Scientific name
- Ranunculus omiophyllus
Campsicnemus scambus
- Group
- True flies
- Records since 2000
- 633
- Peak month
- June
Deadly Nightshade
- Group
- Flowering plants
- Records since 2000
- 633
- Scientific name
- Atropa belladonna
Phaonia pallida
- Group
- True flies
- Records since 2000
- 632
- Peak month
- June
Greater Quaking-grass
- Group
- Flowering plants
- Records since 2000
- 627
- Scientific name
- Briza maxima
Pontocrates arcticus
- Group
- Crustaceans
- Records since 2000
- 627
- Peak month
- June
Tall-clustered Thread-moss
- Group
- Mosses
- Records since 2000
- 627
- Scientific name
- Ptychostomum pallescens
Gnathonarium dentatum
- Group
- Spiders
- Records since 2000
- 626
- Peak month
- June
Minettia longipennis
- Group
- True flies
- Records since 2000
- 623
- Peak month
- June
Contacyphon laevipennis
- Group
- Beetles
- Records since 2000
- 622
- Peak month
- June
Bordered White
- Group
- Butterflies and moths
- Records since 2000
- 620
- Scientific name
- Bupalus piniaria
Alosterna tabacicolor
- Group
- Beetles
- Records since 2000
- 618
- Peak month
- June
Italian Rye-grass
- Group
- Flowering plants
- Records since 2000
- 618
- Scientific name
- Lolium multiflorum
Phyllobius virideaeris
- Group
- Beetles
- Records since 2000
- 617
- Peak month
- June
Brussels Lace
- Group
- Butterflies and moths
- Records since 2000
- 614
- Scientific name
- Cleorodes lichenaria
Eriophyes similis
- Group
- Mites, harvestmen and other arachnids
- Records since 2000
- 610
- Peak month
- June
Willow-leaved Cotoneaster
- Group
- Flowering plants
- Records since 2000
- 609
- Scientific name
- Cotoneaster salicifolius
Black-beaked green weevil
- Group
- Beetles
- Records since 2000
- 608
- Scientific name
- Hypera nigrirostris
Marsupella aquatica
- Group
- Liverworts
- Records since 2000
- 607
- Peak month
- June
Sea Cauliflower
- Group
- Seaweeds and algae
- Records since 2000
- 607
- Scientific name
- Leathesia marina
Lesser Butterfly-orchid
- Group
- Flowering plants
- Records since 2000
- 606
- Scientific name
- Platanthera bifolia
Druce's crane's-bill
- Group
- Flowering plants
- Records since 2000
- 605
- Scientific name
- Geranium oxonianum
Stenus impressus
- Group
- Beetles
- Records since 2000
- 605
- Peak month
- June
Oedothorax fuscus
- Group
- Spiders
- Records since 2000
- 604
- Peak month
- June
Ecnomus tenellus
- Group
- Caddisflies
- Records since 2000
- 603
- Peak month
- June
Dark-winged Flesh fly
- Group
- True flies
- Records since 2000
- 601
- Scientific name
- Nyctia halterata
Beach morning glory
- Group
- Flowering plants
- Records since 2000
- 600
- Scientific name
- Calystegia soldanella
Shore fly
- Group
- True flies
- Records since 2000
- 599
- Scientific name
- Scatella stagnalis
Ptychoptera lacustris
- Group
- True flies
- Records since 2000
- 596
- Peak month
- June
Orange-belted Plumehorn
- Group
- True flies
- Records since 2000
- 593
- Scientific name
- Volucella inflata
Blue-bordered Carpet
- Group
- Butterflies and moths
- Records since 2000
- 590
- Scientific name
- Plemyria rubiginata
Centipede
- Group
- Centipedes
- Records since 2000
- 590
- Scientific name
- Lithobius forficatus
Stenus nitidiusculus
- Group
- Beetles
- Records since 2000
- 590
- Peak month
- June
Tipula unca
- Group
- True flies
- Records since 2000
- 590
- Peak month
- June
Crown-pink
- Group
- Flowering plants
- Records since 2000
- 587
- Scientific name
- Silene coronaria
Campsicnemus curvipes
- Group
- True flies
- Records since 2000
- 586
- Peak month
- June
Malthinus seriepunctatus
- Group
- Beetles
- Records since 2000
- 586
- Peak month
- June
Starflower
- Group
- Flowering plants
- Records since 2000
- 586
- Scientific name
- Lysimachia europaea
Small Sweet-grass
- Group
- Flowering plants
- Records since 2000
- 585
- Scientific name
- Glyceria declinata
White Sedge
- Group
- Flowering plants
- Records since 2000
- 585
- Scientific name
- Carex canescens
Armenian crane's-bill
- Group
- Flowering plants
- Records since 2000
- 581
- Scientific name
- Geranium psilostemon
Boston Facelina
- Group
- Molluscs
- Records since 2000
- 581
- Scientific name
- Facelina bostoniensis
Demetrias imperialis
- Group
- Beetles
- Records since 2000
- 581
- Peak month
- June