Tuberous Polypore
- Group
- Fungi
- Records since 2000
- 494
- Scientific name
- Polyporus tuberaster
European river lamprey, River Lamprey
- Group
- Fish
- Records since 2000
- 493
- Scientific name
- Lampetra fluviatilis
Baird’s slickhead, Baird's Smooth-head
- Group
- Fish
- Records since 2000
- 492
- Scientific name
- Alepocephalus bairdii
Lesser Gray Shrike
- Group
- Birds
- Records since 2000
- 491
- Scientific name
- Lanius minor
Barrel Jelly
- Group
- Jellyfish, corals and anemones
- Records since 2000
- 487
- Scientific name
- Rhizostoma pulmo
Cyclotella meneghiniana
- Group
- Seaweeds and algae
- Records since 2000
- 483
- Peak month
- September
Neuroterus numismalis
- Group
- Bees, wasps and ants
- Records since 2000
- 481
- Peak month
- September
Black-punctured leaf beetle
- Group
- Beetles
- Records since 2000
- 479
- Scientific name
- Galeruca tanaceti
Risso's Crab
- Group
- Crustaceans
- Records since 2000
- 477
- Scientific name
- Xantho pilipes
Limnophyes eltoni
- Group
- True flies
- Records since 2000
- 476
- Peak month
- September
Mottled Shield Bug
- Group
- True bugs
- Records since 2000
- 475
- Scientific name
- Rhaphigaster nebulosa
Maned sea anemone
- Group
- Jellyfish, corals and anemones
- Records since 2000
- 474
- Scientific name
- Hormathia digitata
Nitzschia amphibia
- Group
- Seaweeds and algae
- Records since 2000
- 473
- Peak month
- September
Nitzschia recta
- Group
- Seaweeds and algae
- Records since 2000
- 473
- Peak month
- September
Golovinomyces sonchicola
- Group
- Fungi
- Records since 2000
- 472
- Peak month
- September
Eucampia zodiacus
- Group
- Seaweeds and algae
- Records since 2000
- 467
- Peak month
- September
Astacilla dilatata
- Group
- Crustaceans
- Records since 2000
- 466
- Peak month
- September
Bleeding Bonnet
- Group
- Fungi
- Records since 2000
- 459
- Scientific name
- Mycena sanguinolenta
Fir-Fireweed rust
- Group
- Fungi
- Records since 2000
- 459
- Scientific name
- Pucciniastrum epilobii
Navicula reichardtiana
- Group
- Seaweeds and algae
- Records since 2000
- 457
- Peak month
- September
Navicula rhynchocephala
- Group
- Seaweeds and algae
- Records since 2000
- 456
- Peak month
- September
Nitzschia linearis
- Group
- Seaweeds and algae
- Records since 2000
- 456
- Peak month
- September
Pink bull's-eye lichen
- Group
- Lichens
- Records since 2000
- 455
- Scientific name
- Placopsis lambii
Yellow swamp brittlegill
- Group
- Fungi
- Records since 2000
- 455
- Scientific name
- Russula claroflava
Notonecta obliqua
- Group
- True bugs
- Records since 2000
- 449
- Peak month
- September
Parrot feather watermilfoil
- Group
- Flowering plants
- Records since 2000
- 449
- Scientific name
- Myriophyllum aquaticum
Nitzschia capitellata
- Group
- Seaweeds and algae
- Records since 2000
- 448
- Peak month
- September
Abra tenuis
- Group
- Molluscs
- Records since 2000
- 447
- Peak month
- September
Cerobasis guestfalica
- Group
- Other insects
- Records since 2000
- 447
- Peak month
- September
Haliplus flavicollis
- Group
- Beetles
- Records since 2000
- 447
- Peak month
- September
Euglesa subtruncata
- Group
- Molluscs
- Records since 2000
- 445
- Peak month
- September
Fuscoporia ferruginosa
- Group
- Fungi
- Records since 2000
- 445
- Peak month
- September
Euconulus alderi
- Group
- Molluscs
- Records since 2000
- 442
- Peak month
- September
Epizoanthus papillosus
- Group
- Jellyfish, corals and anemones
- Records since 2000
- 440
- Peak month
- September
Lactarius vietus
- Group
- Fungi
- Records since 2000
- 440
- Peak month
- September
Stictopleurus abutilon
- Group
- True bugs
- Records since 2000
- 440
- Peak month
- September
Lesser Pipefish
- Group
- Fish
- Records since 2000
- 438
- Scientific name
- Syngnathus rostellatus
Acalypta parvula
- Group
- True bugs
- Records since 2000
- 437
- Peak month
- September
Iphimedia minuta
- Group
- Crustaceans
- Records since 2000
- 437
- Peak month
- September
Navicula capitatoradiata
- Group
- Seaweeds and algae
- Records since 2000
- 437
- Peak month
- September
Corophium arenarium
- Group
- Crustaceans
- Records since 2000
- 433
- Peak month
- September
Stilbus testaceus
- Group
- Beetles
- Records since 2000
- 433
- Peak month
- September
Limnophyes asquamatus
- Group
- True flies
- Records since 2000
- 430
- Peak month
- September
Aetea anguina
- Group
- Bryozoans
- Records since 2000
- 429
- Peak month
- September
Hesperocorixa castanea
- Group
- True bugs
- Records since 2000
- 429
- Peak month
- September
Paracorixa concinna
- Group
- True bugs
- Records since 2000
- 429
- Peak month
- September
Fragilaria bidens
- Group
- Seaweeds and algae
- Records since 2000
- 427
- Peak month
- September
Lathagrium fuscovirens
- Group
- Lichens
- Records since 2000
- 427
- Peak month
- September