Euglesa obtusalis
- Peak month
- May
- Records since 2000
- 304
- Group
- Molluscs
Odostomia turrita
- Peak month
- May
- Records since 2000
- 303
- Group
- Molluscs
Clausilia dubia
- Peak month
- August
- Records since 2000
- 299
- Group
- Molluscs
Desmoulin's whorl snail
- Peak month
- October
- Records since 2000
- 297
- Scientific name
- Vertigo moulinsiana
Petricolaria pholadiformis
- Peak month
- April
- Records since 2000
- 297
- Group
- Molluscs
Large-mouthed Valve Snail
- Peak month
- May
- Records since 2000
- 295
- Scientific name
- Valvata macrostoma
Astarte montagui
- Peak month
- March
- Records since 2000
- 294
- Group
- Molluscs
Coryphella lineata
- Peak month
- June
- Records since 2000
- 293
- Group
- Molluscs
Ear pond snail
- Peak month
- June
- Records since 2000
- 293
- Scientific name
- Radix auricularia
Mendicula pygmaea
- Peak month
- October
- Records since 2000
- 293
- Group
- Molluscs
Mud pond snail
- Peak month
- May
- Records since 2000
- 293
- Scientific name
- Omphiscola glabra
Viviparus viviparus
- Peak month
- June
- Records since 2000
- 291
- Group
- Molluscs
Eubranchus tricolor
- Peak month
- August
- Records since 2000
- 288
- Group
- Molluscs
Turbonilla acuta
- Peak month
- April
- Records since 2000
- 288
- Group
- Molluscs
Alvania punctura
- Peak month
- May
- Records since 2000
- 280
- Group
- Molluscs
Brachystomia eulimoides
- Peak month
- September
- Records since 2000
- 279
- Group
- Molluscs
Pholas dactylus
- Peak month
- August
- Records since 2000
- 278
- Group
- Molluscs
Myosotella myosotis
- Peak month
- June
- Records since 2000
- 275
- Group
- Molluscs
Pallid chink shell
- Peak month
- September
- Records since 2000
- 270
- Scientific name
- Lacuna pallidula
Limaria loscombi
- Peak month
- May
- Records since 2000
- 267
- Group
- Molluscs
Rhombosepion orbignyanum
- Peak month
- July
- Records since 2000
- 264
- Group
- Molluscs
Cyrillia linearis
- Peak month
- September
- Records since 2000
- 263
- Group
- Molluscs
Ambigolimax parvipenis
- Peak month
- October
- Records since 2000
- 260
- Group
- Molluscs
Pisidium amnicum
- Peak month
- September
- Records since 2000
- 260
- Group
- Molluscs
A spire snail
- Peak month
- September
- Records since 2000
- 258
- Scientific name
- Ecrobia ventrosa
Ferrissia californica
- Peak month
- October
- Records since 2000
- 258
- Group
- Molluscs
Adontorhina similis
- Peak month
- March
- Records since 2000
- 254
- Group
- Molluscs
Parthenina interstincta
- Peak month
- May
- Records since 2000
- 251
- Group
- Molluscs
Amphorina farrani
- Peak month
- August
- Records since 2000
- 247
- Group
- Molluscs
Least chink shell
- Peak month
- August
- Records since 2000
- 247
- Scientific name
- Lacuna parva
Milax gagates
- Peak month
- August
- Records since 2000
- 242
- Group
- Molluscs
Brackish cockle
- Peak month
- July
- Records since 2000
- 239
- Scientific name
- Cerastoderma glaucum
Solecurtus scopula
- Peak month
- August
- Records since 2000
- 237
- Group
- Molluscs
Euglesa pseudosphaerium
- Peak month
- May
- Records since 2000
- 234
- Group
- Molluscs
Leiostyla anglica
- Peak month
- May
- Records since 2000
- 232
- Group
- Molluscs
Grey sea slug
- Peak month
- May
- Records since 2000
- 231
- Scientific name
- Aeolidia papillosa
Ash Gyro
- Peak month
- July
- Records since 2000
- 230
- Scientific name
- Gyraulus parvus
Callochiton septemvalvis
- Peak month
- July
- Records since 2000
- 227
- Group
- Molluscs
Bittium reticulatum
- Peak month
- May
- Records since 2000
- 226
- Group
- Molluscs
Parthenina indistincta
- Peak month
- May
- Records since 2000
- 226
- Group
- Molluscs
The Shining Ram's-horn Snail
- Peak month
- May
- Records since 2000
- 223
- Scientific name
- Segmentina nitida
Epilepton clarkiae
- Peak month
- March
- Records since 2000
- 221
- Group
- Molluscs
Sorgenfreispira brachystoma
- Peak month
- July
- Records since 2000
- 216
- Group
- Molluscs
Boreochiton ruber
- Peak month
- July
- Records since 2000
- 214
- Group
- Molluscs
Ondina divisa
- Peak month
- April
- Records since 2000
- 214
- Group
- Molluscs
Crisilla semistriata
- Peak month
- May
- Records since 2000
- 213
- Group
- Molluscs
Alvania beanii
- Peak month
- July
- Records since 2000
- 212
- Group
- Molluscs
Tritia varicosa
- Peak month
- March
- Records since 2000
- 211
- Group
- Molluscs