page_title: Terrestrial mollusc
section_title: Taxonomic diversity
hierarchical_section_title: Terrestrial mollusc / Taxonomic diversity
caption_attribution_description: English: 4.5 cm small (full length) slug Laevicaulis alte (Férussac, 1822). Čeština: Asi 4,5 cm velký (když je natažený) plž druhu Laevicaulis alte (Férussac, 1822).
context_page_description: Terrestrial molluscs or land molluscs are an ecological group that includes all molluscs that live on land in contrast to freshwater and marine molluscs.
context_section_description: According to an estimate from Cameron, of the 409 existing gastropod families, 119 include terrestrial molluscs. Among these 119 families, 104 are Stylommatophora, 7 are terrestrial pulmonates other than stylommatophorans, and 8 are operculates (formerly "prosobranchs", molluscs with an operculum, a group that primarily consists of marine snails). 
  "Prosobranchs"
  Cyclophoroidea (up to 10 families in different classifications)
  Helicinidae, Proserpinellidae and Proserpinidae (in the superfamily Helicinoidea)
  Pomatiidae (in the superfamily Littorinoidea, which consist mainly of marine snails)
  Assimineidae and Truncatellidae (in the superfamily Truncatelloidea, which consist mainly of aquatic snails; most species semi-marine)
  "Pulmonates"
  Amphiboloidea (three families of land and semi-marine snails)
  Ellobioidea (Ellobiida) (1-5 families in different classifications, some of the species live in litoral both in marine and terrestrial habitats)
  Systellommatophora (3 families of land and semi-marine slugs)
  Stylommatophora (more than 100 families of land snails and slugs)
caption: Land systellommatophoran slug Laevicaulis alte
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