Gyraulus acronicus
- Peak month
- July
- Records since 2000
- 99
- Group
- Molluscs
Clelandella miliaris
- Peak month
- February
- Records since 2000
- 98
- Group
- Molluscs
Favorinus blianus
- Peak month
- June
- Records since 2000
- 98
- Group
- Molluscs
Striarca lactea
- Peak month
- May
- Records since 2000
- 98
- Group
- Molluscs
Ondina diaphana
- Peak month
- May
- Records since 2000
- 97
- Group
- Molluscs
Pseudotrichia rubiginosa
- Peak month
- October
- Records since 2000
- 97
- Group
- Molluscs
Cochlicella barbara
- Peak month
- July
- Records since 2000
- 95
- Group
- Molluscs
Eulima glabra
- Peak month
- January
- Records since 2000
- 94
- Group
- Molluscs
Coryphella verrucosa
- Peak month
- August
- Records since 2000
- 92
- Group
- Molluscs
Aegires punctilucens
- Peak month
- May
- Records since 2000
- 91
- Group
- Molluscs
Palio nothus
- Peak month
- August
- Records since 2000
- 91
- Group
- Molluscs
Thracia gracilis
- Peak month
- May
- Records since 2000
- 91
- Group
- Molluscs
Dun Sentinel
- Peak month
- October
- Records since 2000
- 90
- Scientific name
- Assiminea grayana
Pisidium subtruncatum
- Peak month
- March
- Records since 2000
- 90
- Group
- Molluscs
Euglesa parvula
- Peak month
- August
- Records since 2000
- 89
- Group
- Molluscs
Tellimya tenella
- Peak month
- January
- Records since 2000
- 89
- Group
- Molluscs
Jordaniella nivosa
- Peak month
- April
- Records since 2000
- 88
- Group
- Molluscs
Marsenia perspicua
- Peak month
- August
- Records since 2000
- 88
- Group
- Molluscs
Deroceras agreste
- Peak month
- August
- Records since 2000
- 87
- Group
- Molluscs
Aeolidia filomenae
- Peak month
- March
- Records since 2000
- 86
- Group
- Molluscs
Stenosemus albus
- Peak month
- August
- Records since 2000
- 84
- Group
- Molluscs
Eatonina fulgida
- Peak month
- September
- Records since 2000
- 83
- Group
- Molluscs
Cardiomya costellata
- Peak month
- March
- Records since 2000
- 82
- Group
- Molluscs
Hydrobia acuta
- Peak month
- September
- Records since 2000
- 82
- Group
- Molluscs
Sea slug
- Peak month
- May
- Records since 2000
- 82
- Scientific name
- Doris sticta
Aeolidiella glauca
- Peak month
- June
- Records since 2000
- 81
- Group
- Molluscs
Coryphella gracilis
- Peak month
- May
- Records since 2000
- 81
- Group
- Molluscs
Philinissima denticulata
- Peak month
- April
- Records since 2000
- 81
- Group
- Molluscs
Duvaucelia plebeia
- Peak month
- June
- Records since 2000
- 80
- Group
- Molluscs
Musculus costulatus
- Peak month
- July
- Records since 2000
- 80
- Group
- Molluscs
Cranchia scabra
- Peak month
- July
- Records since 2000
- 79
- Group
- Molluscs
Green Snail
- Peak month
- August
- Records since 2000
- 79
- Scientific name
- Ponentina subvirescens
Sphaerium nucleus
- Peak month
- December
- Records since 2000
- 79
- Group
- Molluscs
Colpodaspis pusilla
- Peak month
- May
- Records since 2000
- 78
- Group
- Molluscs
Tadpole Physa
- Peak month
- May
- Records since 2000
- 77
- Scientific name
- Physella gyrina
Amphorina pallida
- Peak month
- June
- Records since 2000
- 75
- Group
- Molluscs
Conrad's False Mussel
- Peak month
- November
- Records since 2000
- 75
- Scientific name
- Mytilopsis leucophaeata
Melanella polita
- Peak month
- May
- Records since 2000
- 75
- Group
- Molluscs
Tritia nitida
- Peak month
- April
- Records since 2000
- 75
- Group
- Molluscs
Swollen River Mussel
- Peak month
- July
- Records since 2000
- 74
- Scientific name
- Unio tumidus
Thyasira sarsii
- Peak month
- June
- Records since 2000
- 74
- Group
- Molluscs
Trinchesia caerulea
- Peak month
- May
- Records since 2000
- 74
- Group
- Molluscs
A mollusc
- Peak month
- August
- Records since 2000
- 73
- Scientific name
- Backeljaia gigaxii
Hermaea bifida
- Peak month
- September
- Records since 2000
- 72
- Group
- Molluscs
Tandonia cristata
- Peak month
- October
- Records since 2000
- 72
- Group
- Molluscs
Lomanotus genei
- Peak month
- June
- Records since 2000
- 71
- Group
- Molluscs
Alvania testae
- Peak month
- July
- Records since 2000
- 69
- Group
- Molluscs
Caecum trachea
- Peak month
- May
- Records since 2000
- 69
- Group
- Molluscs