Essex Skipper
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 31,187
Described in 1808
82 species
Thickback Sole
- Group
- Fish
- Peak month
- March
- Records since 2000
- 18,651
Starry ray, Thorny skate
- Group
- Fish
- Peak month
- August
- Records since 2000
- 12,880
Smoky Wainscot
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 6,750
Red Thread-gilled Worm
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 4,250
Elongate abra
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 4,086
Rusty Urchin-shell
- Group
- Molluscs
- Peak month
- June
- Records since 2000
- 2,852
Hydroporus pubescens
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,670
Sturm's diving beetle
- Group
- Beetles
- Peak month
- October
- Records since 2000
- 2,470
Small-Ear Fileclam
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 2,321
Smooth Nutclam
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 1,758
Burrowing mud shrimp
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 1,727
Anthura gracilis
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 1,503
Myxicola infundibulum
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 1,499
Ischnopterapion loti
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 1,199
Crescent
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 1,151
Cross-Sculpture Crenella
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 928
Clover Seed Weevil
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 811
Mottled tube-maker
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 806
Bryer's Nut Crab
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 778
Ceratapion onopordi
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 758
Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 586
Eutrichapion ervi
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 577
Hydroporus umbrosus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 530
Hoary Footman
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 477
Protapion nigritarse
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 459
Nartus grapii
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 449
Goniodoris nodosa
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 420
Gyrinus marinus
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 413
Ptenidium pusillum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 398
Apion haematodes
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 395
Apseudes talpa
- Group
- Crustaceans
- Peak month
- March
- Records since 2000
- 365
Catapion seniculus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 357
Ilybius guttiger
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 357
Montacuta substriata
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 330
Delicate
- Group
- Butterflies and moths
- Peak month
- September
- Records since 2000
- 327
Heterarthrus vagans
- Group
- Bees, wasps and ants
- Peak month
- October
- Records since 2000
- 302
Stromboceros delicatulus
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 270
Ceratapion carduorum
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 255
Maera grossimana
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 241
Parthenina indistincta
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 226
Sand hopper
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 222
Oxystoma subulatum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 220
Upogebia stellata
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 217
Crisilla semistriata
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 213
Cotton bollworm
- Group
- Butterflies and moths
- Peak month
- September
- Records since 2000
- 205
Atomaria fuscata
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 195
Aspidiphorus orbiculatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 193
Stenopterapion tenue
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 191
Ampithoe rubricata
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 188
Omphalapion hookerorum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 188
Stenelmis canaliculata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 185
Holotrichapion ononis
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 148
Platycampus luridiventris
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 142
Spodoptera exigua
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 142
Cercyon littoralis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 139
Ametastegia equiseti
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 138
Endeis spinosa
- Group
- Other invertebrates
- Peak month
- August
- Records since 2000
- 136
Pearly underwing
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 132
Pirimela denticulata
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 132
Ametastegia glabrata
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 125
Caliadurgus fasciatellus
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 124
Symphoromyia crassicornis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 120
Skenea serpuloides
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 116
Myrianida pinnigera
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 115
Ione thoracica
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 102
Ametastegia tenera
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 97
Hygrotus nigrolineatus
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 95
Dryophilus pusillus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 88
Pristiphora pallidiventris
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 86
Squamapion atomarium
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 83
Lepidonotus clava
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 81
Synapion ebeninum
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 80
Agenioideus cinctellus
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 79
Pseudaplemonus limonii
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 79
Pirapion immune
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 76
Agoliinus lapponum
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 66
Leucophytia bidentata
- Group
- Molluscs
- Peak month
- October
- Records since 2000
- 66
Stenopterapion meliloti
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 62
Sphindus dubius
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 61
Late Birch Leaf Edgeminer
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 59
Diplapion confluens
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 52