Hydroid
- Group
- Jellyfish, corals and anemones
- Peak month
- June
- Records since 2000
- 4,829
Described in 1816
61 species
Dwarf swimming crab
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 2,342
Upogebia deltaura
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 2,332
Pink Coryphella
- Group
- Molluscs
- Peak month
- June
- Records since 2000
- 2,061
Rock Urchin
- Group
- Starfish and sea urchins
- Peak month
- June
- Records since 2000
- 1,770
Priapulid worm
- Group
- Other invertebrates
- Peak month
- July
- Records since 2000
- 1,576
Speckled Sea Louse
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 1,485
Botrylloid
- Group
- Sea squirts
- Peak month
- September
- Records since 2000
- 1,358
Polycarpa pomaria
- Group
- Sea squirts
- Peak month
- June
- Records since 2000
- 1,094
Plagioecia patina
- Group
- Bryozoans
- Peak month
- September
- Records since 2000
- 1,011
Solomon's-seal Sawfly
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 964
Aplidium turbinatum
- Group
- Sea squirts
- Peak month
- July
- Records since 2000
- 955
Football Ascidian
- Group
- Sea squirts
- Peak month
- July
- Records since 2000
- 827
Pyura microcosmus
- Group
- Sea squirts
- Peak month
- September
- Records since 2000
- 704
Rhamphomyia crassirostris
- Group
- True flies
- Peak month
- May
- Records since 2000
- 701
Blunt-tailed Snake Millipede
- Group
- Millipedes
- Peak month
- April
- Records since 2000
- 699
Oak Mining Sawfly
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 649
Black jointed coralline
- Group
- Bryozoans
- Peak month
- August
- Records since 2000
- 618
Hilara chorica
- Group
- True flies
- Peak month
- July
- Records since 2000
- 566
Double-star coral
- Group
- Jellyfish, corals and anemones
- Peak month
- August
- Records since 2000
- 540
Sphegina clunipes
- Group
- True flies
- Peak month
- June
- Records since 2000
- 517
Iris Sawfly
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 425
Ocydromia glabricula
- Group
- True flies
- Peak month
- June
- Records since 2000
- 384
Pleurobranchus membranaceus
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 322
Pontophilus spinosus
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 313
Hilara litorea
- Group
- True flies
- Peak month
- July
- Records since 2000
- 300
Amphisbetia distans
- Group
- Jellyfish, corals and anemones
- Peak month
- September
- Records since 2000
- 258
Eutomostethus luteiventris
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 239
Gracilechinus acutus
- Group
- Starfish and sea urchins
- Peak month
- March
- Records since 2000
- 236
Axius stirynchus
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 188
Dolichocephala irrorata
- Group
- True flies
- Peak month
- June
- Records since 2000
- 182
Solenocera membranacea
- Group
- Crustaceans
- Peak month
- March
- Records since 2000
- 170
Scolioneura betuleti
- Group
- Bees, wasps and ants
- Peak month
- October
- Records since 2000
- 168
Rhamphomyia flava
- Group
- True flies
- Peak month
- June
- Records since 2000
- 156
Chalarus spurius
- Group
- True flies
- Peak month
- May
- Records since 2000
- 145
Bryaxis bulbifer
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 144
Mantis shrimp
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 142
Criorhina asilica
- Group
- True flies
- Peak month
- May
- Records since 2000
- 140
Microcosmus claudicans
- Group
- Sea squirts
- Peak month
- June
- Records since 2000
- 140
Philocheras fasciatus
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 133
Celleporina caliciformis
- Group
- Bryozoans
- Peak month
- July
- Records since 2000
- 127
Ringed Teal
- Group
- Birds
- Peak month
- November
- Records since 2000
- 123
Chelifera precatoria
- Group
- True flies
- Peak month
- June
- Records since 2000
- 120
Fulvous Duck
- Group
- Birds
- Peak month
- May
- Records since 2000
- 116
Hoplocampa crataegi
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 109
Platypalpus nigritarsis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 107
Idotea pelagica
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 106
Caliroa annulipes
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 101
Platypalpus ciliaris
- Group
- True flies
- Peak month
- June
- Records since 2000
- 97
Early Birch Leaf Edgeminer
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 96
Rhamphomyia variabilis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 88
Hermaea bifida
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 72
Birka cinereipes
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 71
Empis grisea
- Group
- True flies
- Peak month
- July
- Records since 2000
- 66
Marinogammarus marinus
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 63
Brachythops flavens
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 62
Metallus pumilus
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 60
Brachygluta fossulata
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 59
Styela canopus
- Group
- Sea squirts
- Peak month
- July
- Records since 2000
- 55
Hoplocampa chrysorrhoea
- Group
- Bees, wasps and ants
- Peak month
- April
- Records since 2000
- 52
Hilara nigrina
- Group
- True flies
- Peak month
- July
- Records since 2000
- 51