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Includes data provided by the Environment Agency.

Viviparidae 🔗 Records Tetrads First record Last record Phenology
Viviparus contectus 🔗 🌐 61 24 1969 2016
Viviparus viviparus 🔗 🌐 393 55 1970 2015
Assimineidae 🔗 Records Tetrads First record Last record Phenology
Assiminea grayana 🔗 🌐 9 6 1970 1997
Bithyniidae 🔗 Records Tetrads First record Last record Phenology
Bithynia tentaculata 🔗 🌐 2432 261 1969 2015
Bithynia leachii 🔗 🌐 503 120 1970 2015
Hydrobiidae 🔗 Records Tetrads First record Last record Phenology
Hydrobia acuta 🔗 🌐 12 6 1971 1990
Hydrobia ventrosa seg. 🔗 🌐 1 1 1973 1973
Ecrobia ventrosa 🔗 🌐 1 1 2006 2006
Peringia ulvae 🔗 🌐 118 32 1970 2013
Tateidae 🔗 Records Tetrads First record Last record Phenology
Potamopyrgus antipodarum 🔗 🌐 4287 442 1970 2015
Ellobiidae 🔗 Records Tetrads First record Last record Phenology
Myosotella myosotis 🔗 🌐 13 8 1970 2006
Acroloxidae 🔗 Records Tetrads First record Last record Phenology
Acroloxus lacustris 🔗 🌐 281 69 1971 2015
Lymnaeidae 🔗 Records Tetrads First record Last record Phenology
Galba truncatula 🔗 🌐 143 93 1970 2015
Lymnaea fuscus 🔗 🌐 4 4 2014 2015
Lymnaea palustris 🔗 🌐 26 17 1980 2003
Omphiscola glabra 🔗 🌐 4 1 1996 1996
Radix peregra 🔗 🌐 2378 350 1970 2012
Radix balthica 🔗 🌐 1266 242 2005 2016
Radix auricularia 🔗 🌐 347 106 1969 2015
Lymnaea stagnalis 🔗 🌐 1047 193 1970 2016
Stagnicola palustris 🔗 🌐 446 156 1969 2015
Physidae 🔗 Records Tetrads First record Last record Phenology
Aplexa hypnorum 🔗 🌐 46 37 1970 2013
Physa fontinalis 🔗 🌐 1991 265 1970 2015
Physella acuta 🔗 🌐 47 33 1992 2015
Planorbidae 🔗 Records Tetrads First record Last record Phenology
Ancylus fluviatilis 🔗 🌐 611 85 1972 2015
Anisus leucostoma 🔗 🌐 131 94 1970 2015
Anisus vortex 🔗 🌐 2816 296 1970 2015
Ferrissia wautieri 🔗 🌐 2 1 2005 2005
Gyraulus crista 🔗 🌐 818 160 1972 2015
Gyraulus albus 🔗 🌐 1234 224 1970 2015
Gyraulus laevis 🔗 🌐 29 18 1969 2011
Hippeutis complanatus 🔗 🌐 414 104 1970 2015
Menetus dilatatus 🔗 🌐 1 1 1972 1972
Planorbarius corneus 🔗 🌐 296 109 1969 2016
Bathyomphalus contortus 🔗 🌐 1201 185 1970 2015
Planorbis carinatus 🔗 🌐 939 174 1970 2015
Planorbis planorbis 🔗 🌐 1029 236 1969 2015
Neritidae 🔗 Records Tetrads First record Last record Phenology
Theodoxus fluviatilis 🔗 🌐 302 35 1974 2015
Pomatiidae 🔗 Records Tetrads First record Last record Phenology
Pomatias elegans 🔗 🌐 8 7 1973 1993
Agriolimacidae 🔗 Records Tetrads First record Last record Phenology
Deroceras laeve 🔗 🌐 60 49 1970 2006
Deroceras reticulatum 🔗 🌐 161 110 1920 2006
Deroceras invadens 🔗 🌐 35 19 1997 2006
Arionidae 🔗 Records Tetrads First record Last record Phenology
Arion vulgaris 🔗 🌐 1 2005 2005
Arion circumscriptus 🔗 🌐 97 76 1971 2006
Arion hortensis 🔗 🌐 82 71 1970 2003
Arion ater 🔗 🌐 130 100 1970 2016
Arion subfuscus 🔗 🌐 39 30 1973 2006
Arion flagellus 🔗 🌐 2 1 2000 2005
Arion intermedius 🔗 🌐 106 88 1972 2006
Arion fasciatus 🔗 🌐 18 14 1970 2005
Arion distinctus 🔗 🌐 48 32 1989 2006
Arion circumscriptus seg. 🔗 🌐 14 14 1971 2000
Azecidae 🔗 Records Tetrads First record Last record Phenology
Azeca goodalli 🔗 🌐 3 3 1970 2006
Boettgerillidae 🔗 Records Tetrads First record Last record Phenology
Boettgerilla pallens 🔗 🌐 7 4 1999 2006
Carychiidae 🔗 Records Tetrads First record Last record Phenology
Carychium minimum 🔗 🌐 43 35 1970 2006
Carychium tridentatum 🔗 🌐 16 16 1974 1996
Carychium minimum seg. 🔗 🌐 8 7 1972 1982
Clausiliidae 🔗 Records Tetrads First record Last record Phenology
Balea perversa 🔗 🌐 11 4 1974 2008
Clausilia bidentata 🔗 🌐 66 51 1970 2016
Cochlodina laminata 🔗 🌐 67 50 1970 2016
Cochlicopidae 🔗 Records Tetrads First record Last record Phenology
Cochlicopa cf. lubricella 🔗 🌐 8 7 1972 1977
Cochlicopa cf. lubrica 🔗 🌐 112 86 1970 1982
Enidae 🔗 Records Tetrads First record Last record Phenology
Merdigera obscura 🔗 🌐 31 26 1970 2006
Euconulidae 🔗 Records Tetrads First record Last record Phenology
Euconulus cf. alderi 🔗 🌐 6 3 1988 2003
Euconulus cf. fulvus 🔗 🌐 43 37 1970 1979
Euconulus fulvus seg. 🔗 🌐 4 4 1971 1975
Ferussaciidae 🔗 Records Tetrads First record Last record Phenology
Cecilioides acicula 🔗 🌐 5 4 1976 1981
Gastrodontidae 🔗 Records Tetrads First record Last record Phenology
Zonitoides nitidus 🔗 🌐 57 50 1920 2016
Zonitoides excavatus 🔗 🌐 5 3 1970 1974
Helicidae 🔗 Records Tetrads First record Last record Phenology
Cepaea nemoralis 🔗 🌐 219 163 1920 2016
Cepaea hortensis 🔗 🌐 66 52 1969 2016
Cornu aspersum 🔗 🌐 141 110 1969 2016
Helicigona lapicida 🔗 🌐 11 3 1974 2008
Helix pomatia 🔗 🌐 1 1 1974 1974
Hygromiidae 🔗 Records Tetrads First record Last record Phenology
Ashfordia granulata 🔗 🌐 5 4 1973 1996
Candidula gigaxii 🔗 🌐 18 12 1970 1996
Candidula intersecta 🔗 🌐 63 50 1920 2006
Cernuella virgata 🔗 🌐 69 54 1920 2016
Helicella itala 🔗 🌐 26 20 1970 1987
Hygromia cinctella 🔗 🌐 2 2 2004 2016
Monacha cantiana 🔗 🌐 131 96 1920 2016
Trochulus hispidus 🔗 🌐 199 150 1920 2011
Trochulus striolatus 🔗 🌐 168 129 1970 2006
Trochulus plebeius 🔗 🌐 31 25 1970 1998
Limacidae 🔗 Records Tetrads First record Last record Phenology
Ambigolimax valentianus 🔗 🌐 6 4 1997 2001
Lehmannia marginata 🔗 🌐 14 13 1976 2014
Limacus flavus 🔗 🌐 18 10 1997 2014
Limacus maculatus 🔗 🌐 3 2 1997 1998
Limax maximus 🔗 🌐 69 52 1973 2006
Limax cinereoniger 🔗 🌐 2 2 1996 1997
Milacidae 🔗 Records Tetrads First record Last record Phenology
Milax gagates 🔗 🌐 9 7 1997 2005
Tandonia budapestensis 🔗 🌐 49 36 1972 2006
Tandonia sowerbyi 🔗 🌐 24 16 1970 2002
Oxychilidae 🔗 Records Tetrads First record Last record Phenology
Aegopinella pura 🔗 🌐 43 37 1970 2006
Aegopinella nitidula 🔗 🌐 121 97 1970 2006
Nesovitrea hammonis 🔗 🌐 53 39 1970 2006
Oxychilus navarricus 🔗 🌐 85 65 1970 2016
Oxychilus draparnaudi 🔗 🌐 6 4 1970 2006
Oxychilus alliarius 🔗 🌐 127 93 1970 2006
Oxychilus cellarius 🔗 🌐 121 89 1970 2016
Patulidae 🔗 Records Tetrads First record Last record Phenology
Discus rotundatus 🔗 🌐 210 156 1970 2016
Pristilomatidae 🔗 Records Tetrads First record Last record Phenology
Vitrea contracta 🔗 🌐 78 62 1920 2006
Vitrea crystallina 🔗 🌐 139 111 1970 2006
Vitrea crystallina seg. 🔗 🌐 11 10 1972 1982
Punctidae 🔗 Records Tetrads First record Last record Phenology
Punctum pygmaeum 🔗 🌐 11 9 1970 2014
Pupillidae 🔗 Records Tetrads First record Last record Phenology
Pupilla muscorum 🔗 🌐 47 40 1971 2006
Pyramidulidae 🔗 Records Tetrads First record Last record Phenology
Pyramidula pusilla 🔗 🌐 13 3 1972 2008
Succineidae 🔗 Records Tetrads First record Last record Phenology
Oxyloma elegans 🔗 🌐 52 38 1969 2006
Succinea putris 🔗 🌐 95 69 1970 2016
Testacellidae 🔗 Records Tetrads First record Last record Phenology
Testacella haliotidea 🔗 🌐 1 1 1998 1998
Valloniidae 🔗 Records Tetrads First record Last record Phenology
Acanthinula aculeata 🔗 🌐 6 4 1975 1981
Vallonia costata 🔗 🌐 57 48 1970 2006
Vallonia cf. excentrica 🔗 🌐 85 67 1970 2006
Vallonia pulchella 🔗 🌐 22 18 1970 1994
Vallonia pulchella seg. 🔗 🌐 2 2 1982 1996
Vertiginidae 🔗 Records Tetrads First record Last record Phenology
Columella edentula 🔗 🌐 1 1 2004 2004
Truncatellina cylindrica 🔗 🌐 1 1 1977 1977
Vertigo antivertigo 🔗 🌐 7 3 1976 2006
Vertigo pygmaea 🔗 🌐 6 6 1971 2006
Vertigo substriata 🔗 🌐 5 2 1980 1982
Vitrinidae 🔗 Records Tetrads First record Last record Phenology
Vitrina pellucida 🔗 🌐 108 86 1970 2006
Arianta arbustorum 🔗 🌐 116 86 1920 2016
Lauria cylindracea 🔗 🌐 18 17 1970 2012
Valvatidae 🔗 Records Tetrads First record Last record Phenology
Valvata cristata 🔗 🌐 903 163 1970 2015
Valvata macrostoma 🔗 🌐 13 4 1969 1984
Valvata piscinalis 🔗 🌐 2116 227 1970 2015
Dreissenidae 🔗 Records Tetrads First record Last record Phenology
Dreissena polymorpha 🔗 🌐 203 44 1971 2015
Mytilopsis leucophaeata 🔗 🌐 31 7 2006 2014
Sphaeriidae 🔗 Records Tetrads First record Last record Phenology
Musculium lacustre 🔗 🌐 218 104 1970 2015
Pisidium casertanum 🔗 🌐 309 152 1970 2015
Pisidium hibernicum 🔗 🌐 95 55 1975 2015
Pisidium moitessierianum 🔗 🌐 12 5 1970 1990
Pisidium nitidum 🔗 🌐 890 218 1970 2015
Pisidium obtusale 🔗 🌐 14 13 1971 2005
Pisidium pseudosphaerium 🔗 🌐 2 1 1990 1990
Pisidium pulchellum 🔗 🌐 13 12 2006 2015
Pisidium supinum 🔗 🌐 20 10 1973 2011
Pisidium amnicum 🔗 🌐 381 105 1969 2015
Pisidium henslowanum 🔗 🌐 210 63 1970 2015
Pisidium milium 🔗 🌐 119 80 1972 2015
Pisidium personatum 🔗 🌐 54 35 1972 2012
Pisidium subtruncatum 🔗 🌐 1092 240 1970 2015
Sphaerium corneum 🔗 🌐 1858 264 1969 2015
Sphaerium rivicola 🔗 🌐 105 51 1973 2015
Sphaerium solidum 🔗 🌐 17 3 1968 1990
Unionidae 🔗 Records Tetrads First record Last record Phenology
Anodonta anatina 🔗 🌐 118 69 1970 2015
Anodonta cygnea 🔗 🌐 227 81 1970 2016
Unio tumidus 🔗 🌐 18 13 1971 2015
Unio pictorum 🔗 🌐 126 60 1969 2016
Pseudanodonta complanata 🔗 🌐 10 5 1974 2002