Cynips divisa
- Group
- Bees, wasps and ants
- Records since 2000
- 358
- Peak month
- September
Alcyonidium gelatinosum
- Group
- Bryozoans
- Records since 2000
- 356
- Peak month
- September
Gitana sarsi
- Group
- Crustaceans
- Records since 2000
- 356
- Peak month
- September
Ceramium deslongchampsii
- Group
- Seaweeds and algae
- Records since 2000
- 355
- Peak month
- September
Adna anglica
- Group
- Crustaceans
- Records since 2000
- 354
- Peak month
- September
Orchomene humilis
- Group
- Crustaceans
- Records since 2000
- 353
- Peak month
- September
Tubulanus annulatus
- Group
- Other invertebrates
- Records since 2000
- 353
- Peak month
- September
Eurodryas aurinia
- Group
- Butterflies and moths
- Records since 2000
- 352
- Peak month
- September
Berosus affinis
- Group
- Beetles
- Records since 2000
- 351
- Peak month
- September
Bucklandiella obtusa
- Group
- Mosses
- Records since 2000
- 347
- Peak month
- September
Nitzschia media
- Group
- Seaweeds and algae
- Records since 2000
- 347
- Peak month
- September
Ambrosia artemisiifolia
- Group
- Flowering plants
- Records since 2000
- 346
- Peak month
- September
Stictotarsus duodecimpustulatus
- Group
- Beetles
- Records since 2000
- 345
- Peak month
- September
Agaricus augustus
- Group
- Fungi
- Records since 2000
- 344
- Peak month
- September
Cauloramphus spiniferum
- Group
- Bryozoans
- Records since 2000
- 344
- Peak month
- September
Erysiphe polygoni
- Group
- Fungi
- Records since 2000
- 343
- Peak month
- September
Acleris rhombana
- Group
- Butterflies and moths
- Records since 2000
- 342
- Peak month
- September
Hincksina flustroides
- Group
- Bryozoans
- Records since 2000
- 342
- Peak month
- September
Petrobius maritimus
- Group
- Other insects
- Records since 2000
- 342
- Peak month
- September
Depressed river mussel
- Group
- Molluscs
- Records since 2000
- 338
- Scientific name
- Pseudanodonta complanata
Leiobunum blackwalli
- Group
- Mites, harvestmen and other arachnids
- Records since 2000
- 338
- Peak month
- September
Russula velenovskyi
- Group
- Fungi
- Records since 2000
- 336
- Peak month
- September
Dytiscus semisulcatus
- Group
- Beetles
- Records since 2000
- 334
- Peak month
- September
Gammarus zaddachi
- Group
- Crustaceans
- Records since 2000
- 333
- Peak month
- September
Staurosirella pinnata
- Group
- Seaweeds and algae
- Records since 2000
- 333
- Peak month
- September
Russula delica
- Group
- Fungi
- Records since 2000
- 332
- Peak month
- September
Black Dogfish
- Group
- Fish
- Records since 2000
- 331
- Scientific name
- Centroscyllium fabricii
Thicklip Mullet
- Group
- Fish
- Records since 2000
- 331
- Scientific name
- Chelon labrosus
Finger-scale foam lichen
- Group
- Lichens
- Records since 2000
- 329
- Scientific name
- Stereocaulon dactylophyllum
A mining bee
- Group
- Bees, wasps and ants
- Records since 2000
- 328
- Scientific name
- Colletes halophilus
Achnanthes conspicua
- Group
- Seaweeds and algae
- Records since 2000
- 328
- Peak month
- September
Perkinsiana rubra
- Group
- Worms (annelids)
- Records since 2000
- 328
- Peak month
- September
Delicate
- Group
- Butterflies and moths
- Records since 2000
- 327
- Scientific name
- Mythimna vitellina
Elysia viridis
- Group
- Molluscs
- Records since 2000
- 327
- Peak month
- September
Eunotia incisa
- Group
- Seaweeds and algae
- Records since 2000
- 327
- Peak month
- September
Laccobius striatulus
- Group
- Beetles
- Records since 2000
- 327
- Peak month
- September
Orbilia xanthostigma
- Group
- Fungi
- Records since 2000
- 326
- Peak month
- September
Awl-leaved swan-neck moss
- Group
- Mosses
- Records since 2000
- 325
- Scientific name
- Campylopus subulatus
Bonelli's Warbler
- Group
- Birds
- Records since 2000
- 325
- Scientific name
- Phylloscopus bonelli
Crab
- Group
- Crustaceans
- Records since 2000
- 324
- Scientific name
- Thia scutellata
Haliplus confinis
- Group
- Beetles
- Records since 2000
- 324
- Peak month
- September
Isopaches bicrenatus
- Group
- Liverworts
- Records since 2000
- 323
- Peak month
- September
Trioxys sunnysidensis
- Group
- Bees, wasps and ants
- Records since 2000
- 323
- Peak month
- September
Simulium variegatum
- Group
- True flies
- Records since 2000
- 322
- Peak month
- September
Idotea balthica
- Group
- Crustaceans
- Records since 2000
- 321
- Peak month
- September
Nitzschia perminuta
- Group
- Seaweeds and algae
- Records since 2000
- 321
- Peak month
- September
Laccobius sinuatus
- Group
- Beetles
- Records since 2000
- 319
- Peak month
- September
Phragmidium rubi-idaei
- Group
- Fungi
- Records since 2000
- 319
- Peak month
- September