page_title: List of non-marine molluscs of Great Britain
section_title: Gastropoda
hierarchical_section_title: List of non-marine molluscs of Great Britain / Systematic list / Gastropoda
caption_attribution_description: English: Photo of Theodoxus fluviatilis. Scale in mm. Locality: Germany: Schleswig-Holstein, Wittensee. Date: 09-1968.
context_page_description: This list comprises 231 species of non-marine molluscs that have been recorded in the scientific literature as part of the fauna of the island of Great Britain; this total excludes species found only in hothouses and aquaria. The list includes terrestrial and aquatic gastropods, and aquatic bivalves. Molluscs that are fully marine are not included here, except for two marine pulmonate snails. In other words, this list includes land snails and slugs, and freshwater and brackish water snails. It also includes freshwater mussels and clams, including some that can tolerate brackish water.
  Great Britain is a European island in the northeastern Atlantic, comprising the contiguous countries of England, Scotland and Wales. The mollusc fauna of the island of Ireland, which includes both the Republic of Ireland and Northern Ireland, is listed in another article: List of non-marine molluscs of Ireland.
  A number of species of snails listed here are sometimes also found on lists of marine species. Two listed here, in the genera Onchidella and Otina, are fully marine in habitat, but are pulmonate snails that breathe air at low tide rather than having gills like most marine species.
context_section_description: Neritidae - aquatic (this species tolerates brackish water)
  Theodoxus fluviatilis fluviatilis (Linnaeus, 1758)
  Aciculidae - terrestrial
  Acicula fusca (Montagu, 1803)
  Viviparidae - aquatic
  Viviparus contectus (Millet, 1813)
  Viviparus viviparus (Linnaeus, 1758)
  Assimineidae - terrestrial (intermediate marine)
  Assiminea grayana Fleming, 1828 - native?
  Paludinella littorina (delle Chiaje, 1828)
  Amnicolidae - aquatic
  Marstoniopsis insubrica (Küster, 1853) - synonym: Marstoniopsis scholtzi (A. Schmidt, 1856) - native?
  Truncatellidae - terrestrial (intermediate marine)
  Truncatella subcylindrica (Linnaeus, 1758)
  Bithyniidae - aquatic
  Bithynia leachii (Sheppard, 1823)
  Bithynia tentaculata (Linnaeus, 1758)
  Cochliopidae - aquatic
  Heleobia stagnorum (Gmelin, 1791) - native?
  Hydrobiidae - aquatic (some are arguably marine)
  Hydrobia acuta (Draparnaud, 1805) - subspecies: Hydrobia acuta neglecta Muus, 1963
  Hydrobia ventrosa (Montagu, 1803)
  Peringia ulvae (Pennant, 1777)
  Mercuria cf. similis (Draparnaud, 1805) = Mercuria confusa (Frauenfeld, 1863)
  Potamopyrgus antipodarum (Gray, 1843) - introduced
  Valvatidae - aquatic
  Valvata cristata O. F. Müller, 1774
  Valvata macrostoma Mörch, 1864
  Valvata piscinalis (O. F. Müller, 1774)
  Pomatiidae - terrestrial
  Pomatias elegans (Müller, 1774)
  The following gastropods are pulmonates:
  Ellobiidae - terrestrial
  Carychium minimum Müller, 1774
  Carychium tridentatum (Risso, 1826)
  Leucophytia bidentata (Montagu, 1808)
  Myosotella denticulata (Montagu, 1803)
  Myosotella myosotis (Draparnaud, 1801)
  Onchidiidae - aquatic (marine but an intertidal pulmonate)
  Onchidella celtica (Cuvier, 1817)
  Otinidae - aquatic (marine but an intertidal pulmonate)
  Otina ovata (Brown, 1827)
  Physidae - aquatic
  Aplexa hypnorum (Linnaeus, 1758)
  Physa fontinalis (Linnaeus, 1758)
  Physella acuta (Draparnaud, 1805) = Physella heterostropha (Say, 1817) - introduced
  Physella gyrina (Say, 1821) - introduced
  Lymnaeidae - aquatic
  Galba truncatula (O. F. Müller, 1774)
  Omphiscola glabra (O. F. Müller, 1774)
  Lymnaea palustris (O. F. Müller, 1774) = Stagnicola palustris (O. F. Müller, 1774)
  Lymnaea stagnalis (Linnaeus, 1758)
  Lymnaea fusca (C. Pfeiffer, 1821)
  Radix auricularia (Linnaeus, 1758)
  Radix balthica (Linnaeus, 1758)
  Radix peregra (Linnaeus, 1758)
  Myxas glutinosa (O. F. Müller, 1774) E
  Planorbidae - aquatic
  Ancylus fluviatilis O. F. Müller, 1774
  Anisus leucostoma (Millet, 1813)
  Anisus vortex (Linnaeus, 1758)
  Anisus vorticulus (Troschel, 1834) E
  Anisus spirorbis (Linnaeus, 1758)
  Planorbis carinatus O. F. Müller, 1774
  Planorbis planorbis (Linnaeus, 1758)
  Bathyomphalus contortus (Linnaeus, 1758)
  Gyraulus laevis (Alder, 1838)
  Gyraulus acronicus (A. Férussac, 1807)
  Gyraulus albus (O. F. Müller, 1774)
  Gyraulus crista (Linnaeus, 1758)
  Hippeutis complanatus (Linnaeus, 1758)
  Segmentina nitida (O. F. Müller, 1774) E
  Planorbarius corneus corneus (Linnaeus, 1758)
  Menetus dilatatus (Gould, 1841) - introduced
  Ferrissia wautieri (Mirolli, 1960) = Ferrissia fragilis (Tryon, 1863) - introduced
  Acroloxidae - aquatic
  Acroloxus lacustris (Linnaeus, 1758)
  Succineidae - terrestrial (some almost amphibious)
  Quickella arenaria (Bouchard-Chantereaux, 1837) = Catinella arenaria
  Succinella oblonga Draparnaud, 1801
  Succinea putris Linnaeus, 1758
  Oxyloma elegans elegans (Risso, 1826) = Oxyloma pfeifferi (Rossmässler, 1835)
  Oxyloma sarsii (Esmark, 1886)
  Cochlicopidae - terrestrial
  Azeca goodalli (A. Férrusac, 1821)
  Cochlicopa cf. lubrica = Cochlicopa lubrica (O. F. Müller, 1774)
  Cochlicopa cf. lubricella = Cochlicopa lubricella (Porro, 1838)
  Pyramidulidae - terrestrial
  Pyramidula pusilla (Vallot, 1801)
  Vertiginidae - terrestrial
  Columella edentula (Draparnaud, 1805)
  Columella aspera Walden, 1966
  Truncatellina cylindrica (Férussac, 1807)
  Truncatellina callicratis (Scacchi, 1833) - probably native
  Vertigo pusilla O. F. Müller, 1774
  Vertigo alpestris Alder, 1838
  Vertigo antivertigo (Draparnaud, 1801)
  Vertigo genesii (Gredler, 1856)
  Vertigo geyeri Lindholm, 1925
  Vertigo lilljeborgi (Westerlund, 1871)
  Vertigo modesta arctica (Say, 1824)
  Vertigo moulinsiana (Dupuy, 1849)
  Verti
caption: Shells of Theodoxus fluviatilis
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