page_title: List of non-marine molluscs of Great Britain
section_title: List of "hothouse alien" species
hierarchical_section_title: List of non-marine molluscs of Great Britain / List of "hothouse alien" species
caption_attribution_description: Melanoides tuberculatus
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: This group of exotic land and freshwater species are not truly part of the fauna because they do not live in the wild. Many are tropical and thus are incapable of surviving in the wild in Great Britain; instead they have established themselves as uninvited inhabitants of greenhouses, aquaria within greenhouses, and similar artificially-heated  habitats.
  Thiaridae - aquatic
  Melanoides tuberculata (O. F. Müller, 1774)
  Gastrodontidae - terrestrial
  Zonitoides arboreus (Say, 1816)
  Lymnaeidae - aquatic
  Radix rubiginosa (Michelin, 1831), native to Indo-China and Indonesia
  Planorbidae - aquatic
  Gyraulus chinensis (Dunker, 1848)
  Planorbella duryi (Wetherby, 1879)
  Pleurodiscidae - terrestrial
  Pleurodiscus balmei (Potiez & Michaud, 1835)
  Pristilomatidae - terrestrial
  Hawaiia minuscula (Binney, 1841)
  Helicodiscidae - terrestrial
  Helicodiscus parallelus (Say, 1821)
  Streptaxidae - terrestrial
  Gulella io Verdcourt, 1974
  Subulinidae - terrestrial
  Allopeas clavulinum (Potiez & Michaud, 1838)
  Opeas hannense (Rang, 1831)
  Rumina decollata (Linnaeus, 1758)
  Striosubulina sp.
  Subulina octona (Bruguière, 1789)
caption: Melanoides tuberculata
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