The Testacelloidea 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
Land snail
A land snail is any of the many species of snail that live on land, as opposed to those that live in salt water and fresh water. Land snails are terrestrial gastropod mollusks that have shells, It is not always an easy matter to say which species are terrestrial, because some are more or less...

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....



The families within the Testacelloidea are as follows:
  • Family Testacellidae Gray, 1840
  • Family Oleacinidae
    Oleacinidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the clade Eupulmonata .-Anatomy:...

     H. Adams & A. Adams, 1855
  • Family Spiraxidae
    Spiraxidae is a family of air-breathing land snails, terrestrial pulmonate gastropods in the clade Eupulmonata .- 2005 taxonomy :...

    H. B. Baker, 1939

This taxonomy was based on the study by Nordsieck, published in 1986, and the publication by Schileyko in 2000.
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