Megaluropus agilis
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 1,556
Described in 1889
19 species
Alder Bead Gall Mite
- Group
- Mites, harvestmen and other arachnids
- Peak month
- July
- Records since 2000
- 912
Leptocylindrus danicus
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 840
Coquillettidia richiardii
- Group
- True flies
- Peak month
- July
- Records since 2000
- 654
Phyllocoptes goniothorax
- Group
- Mites, harvestmen and other arachnids
- Peak month
- May
- Records since 2000
- 625
Aceria brevipunctata
- Group
- Mites, harvestmen and other arachnids
- Peak month
- May
- Records since 2000
- 505
Acartia clausi
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 484
Aceria thomasi
- Group
- Mites, harvestmen and other arachnids
- Peak month
- June
- Records since 2000
- 385
Lysianassa ceratina
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 347
Anaspis garneysi
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 340
Phytoptus avellanae
- Group
- Mites, harvestmen and other arachnids
- Peak month
- May
- Records since 2000
- 320
Thyone roscovita
- Group
- Starfish and sea urchins
- Peak month
- May
- Records since 2000
- 309
Dasineura pustulans
- Group
- True flies
- Peak month
- August
- Records since 2000
- 303
Deflexilodes subnudus
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 146
Clathria spinarcus
- Group
- Sponges
- Peak month
- August
- Records since 2000
- 62
Oulimnius major
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 61
Netelia thomsonii
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 52
Aculus tetanothrix
- Group
- Mites, harvestmen and other arachnids
- Peak month
- August
- Records since 2000
- 50
Anisostephus betulinus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 50