The Clausilioidea are a superfamily
Taxonomic rank
In biological classification, rank is the level in a taxonomic hierarchy. Examples of taxonomic ranks are species, genus, family, and class. Each rank subsumes under it a number of less general categories...

 of air-breathing land snail
Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s and slug
Slug is a common name that is normally applied to any gastropod mollusc that lacks a shell, has a very reduced shell, or has a small internal shell...

s, terrestrial
Terrestrial animal
Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the water , or amphibians, which rely on a combination of aquatic and terrestrial habitats...

 gastropod mollusks in the informal group Sigmurethra
Sigmurethra is a taxonomic category of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs. This is an Informal Group which includes the majority of land snails and slugs....


This classification was based on different studies dealing with the Clausiliidae, published by H. Nordsieck in 1978, 1979, 1981, 1985, 1994, 1997 and 1998.


  • Family Clausiliidae
    Clausiliidae, common name door snails, are a taxonomic family of small, very elongate, mostly left-handed, air-breathing land snails, sinistral terrestrial pulmonate gastropod mollusks....

      Gray, 1855
  • † Family Anadromidae
    Anadromidae is an extinct family of gastropods in the clade Eupulmonata .- Taxonomy :...

      Wenz, 1940
  • † Family Filholiidae
    †Filholiidae is an extinct family of fossil air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Clausilioidea .-Genera :...

      Wenz, 1923
  • † Family Palaeostoidae
    Palaeostoidae is an extinct family of gastropods in the clade Eupulmonata .- Taxonomy :...

    H. Nordsieck, 1986
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