Rayed Glass Snail
- Peak month
- July
- Records since 2000
- 1,467
- Scientific name
- Perpolita hammonis
Variegated Scallop
- Peak month
- August
- Records since 2000
- 1,450
- Scientific name
- Mimachlamys varia
Sea Hare
- Peak month
- June
- Records since 2000
- 1,419
- Scientific name
- Aplysia punctata
Furrowed nutclam
- Peak month
- June
- Records since 2000
- 1,404
- Scientific name
- Nucula sulcata
Sand Gaper, Softshell clam, Long necked clam, Steamer clam
- Peak month
- April
- Records since 2000
- 1,391
- Scientific name
- Mya arenaria
White tortoiseshell limpet
- Peak month
- September
- Records since 2000
- 1,355
- Scientific name
- Tectura virginea
White Ramshorn
- Peak month
- July
- Records since 2000
- 1,347
- Scientific name
- Gyraulus albus
Peppery Furrow Shell
- Peak month
- May
- Records since 2000
- 1,333
- Scientific name
- Scrobicularia plana
Lesser Bulin
- Peak month
- May
- Records since 2000
- 1,329
- Scientific name
- Merdigera obscura
Tawny Glass Snail
- Peak month
- May
- Records since 2000
- 1,311
- Scientific name
- Euconulus fulvus
European spoon clam
- Peak month
- June
- Records since 2000
- 1,310
- Scientific name
- Cochlodesma praetenue
Rayed trough clam
- Peak month
- July
- Records since 2000
- 1,310
- Scientific name
- Mactra stultorum
Nucula hanleyi
- Peak month
- August
- Records since 2000
- 1,275
- Group
- Molluscs
Razor shell
- Peak month
- July
- Records since 2000
- 1,273
- Scientific name
- Ensis ensis
Red Whelk
- Peak month
- September
- Records since 2000
- 1,271
- Scientific name
- Neptunea antiqua
Heath Snail
- Peak month
- June
- Records since 2000
- 1,269
- Scientific name
- Helicella itala
Garden Slug
- Peak month
- March
- Records since 2000
- 1,236
- Scientific name
- Arion hortensis
Long-toothed Herald Snail
- Peak month
- May
- Records since 2000
- 1,233
- Scientific name
- Carychium tridentatum
Arctic Cowrie
- Peak month
- May
- Records since 2000
- 1,228
- Scientific name
- Trivia arctica
Cinereous chiton
- Peak month
- May
- Records since 2000
- 1,228
- Scientific name
- Lepidochitona cinerea
Chocolate arion
- Peak month
- September
- Records since 2000
- 1,227
- Scientific name
- Arion rufus
Oyster Drill
- Peak month
- September
- Records since 2000
- 1,227
- Scientific name
- Ocenebra erinaceus
Marsh Slug
- Peak month
- May
- Records since 2000
- 1,169
- Scientific name
- Deroceras laeve
Common Astarte Clam
- Peak month
- September
- Records since 2000
- 1,161
- Scientific name
- Astarte sulcata
Thick-Lipped Dog Whelk
- Peak month
- May
- Records since 2000
- 1,157
- Scientific name
- Tritia incrassata
Clear Glass Snail
- Peak month
- May
- Records since 2000
- 1,147
- Scientific name
- Aegopinella pura
Roman Snail
- Peak month
- May
- Records since 2000
- 1,128
- Scientific name
- Helix pomatia
Swiss glass-snail
- Peak month
- April
- Records since 2000
- 1,123
- Scientific name
- Oxychilus navarricus
Banded Chink Shell
- Peak month
- August
- Records since 2000
- 1,118
- Scientific name
- Lacuna vincta
Diplodonta rotundata
- Peak month
- August
- Records since 2000
- 1,112
- Group
- Molluscs
Lapidary Snail
- Peak month
- May
- Records since 2000
- 1,108
- Scientific name
- Helicigona lapicida
Milky Crystal Snail
- Peak month
- July
- Records since 2000
- 1,107
- Scientific name
- Vitrea contracta
Glistenworm
- Peak month
- August
- Records since 2000
- 1,103
- Scientific name
- Falcidens crossotus
Papillicardium minimum
- Peak month
- October
- Records since 2000
- 1,096
- Group
- Molluscs
Flat Valve Snail
- Peak month
- May
- Records since 2000
- 1,093
- Scientific name
- Valvata cristata
Dwarf Snail
- Peak month
- July
- Records since 2000
- 1,081
- Scientific name
- Punctum pygmaeum
Balea sarsii
- Peak month
- July
- Records since 2000
- 1,070
- Group
- Molluscs
Thin Tellin
- Peak month
- August
- Records since 2000
- 1,069
- Scientific name
- Macomangulus tenuis
Flat Ramshorn
- Peak month
- May
- Records since 2000
- 1,058
- Scientific name
- Hippeutis complanatus
Lake Limpet
- Peak month
- May
- Records since 2000
- 1,053
- Scientific name
- Acroloxus lacustris
Short-toothed Herald Snail
- Peak month
- July
- Records since 2000
- 1,051
- Scientific name
- Carychium minimum
Crystal Snail
- Peak month
- May
- Records since 2000
- 1,047
- Scientific name
- Vitrea crystallina
Round-mouthed Snail
- Peak month
- May
- Records since 2000
- 1,038
- Scientific name
- Pomatias elegans
Translucent hyala
- Peak month
- June
- Records since 2000
- 1,026
- Scientific name
- Hyala vitrea
Blunt tellin
- Peak month
- August
- Records since 2000
- 1,024
- Scientific name
- Arcopagia crassa
Lobe Shell
- Peak month
- June
- Records since 2000
- 1,019
- Scientific name
- Philine aperta
Hairy Spiny Doris
- Peak month
- July
- Records since 2000
- 1,006
- Scientific name
- Acanthodoris pilosa
Pododesmus patelliformis
- Peak month
- August
- Records since 2000
- 1,005
- Group
- Molluscs