Streptaxoidea is a superfamily

Superfamily

The term superfamily is used to describe several different concepts in different scientific fields:* Superfamily and Superfamily : a level of biological classification; redirects to Taxonomic rank...

 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, 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...

 pulmonate gastropod mollusks in the Stylommatophora

Stylommatophora

Stylommatophora is a taxon of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs. This taxon is currently considered to be a clade. It was previously regarded as an infraorder...

.

2005 taxonomy

There have been recognized the only family Streptaxidae

Streptaxidae

Streptaxidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in theStylommatophora. Six Streptaxidae subfamilies are accepted in the 2005 taxonomy of the Gastropoda by Bouchet & Rocroi....

 within Streptaxoidea in the taxonomy of Bouchet & Rocroi (2005)

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

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2010 taxonomy

Sutcharit et al. (2010) have established a new family Diapheridae within Streptaxoidea as follows:

• family Streptaxidae
  Streptaxidae
  Streptaxidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in theStylommatophora. Six Streptaxidae subfamilies are accepted in the 2005 taxonomy of the Gastropoda by Bouchet & Rocroi....
  
   Gray, 1860
• family Diapheridae
  Diapheridae
  Streptaxidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Streptaxoidea.Sutcharit et al. established the new family Diapheridae within the superfamily Streptaxoidea in 2010.- Genera:...
  
   Panha & Naggs, 2010

Rowson et al. (2011) have confirmed monophyly

Monophyly

In common cladistic usage, a monophyletic group is a taxon which forms a clade, meaning that it contains all the descendants of the possibly hypothetical closest common ancestor of the members of the group. The term is synonymous with the uncommon term holophyly...

 of Streptaxidae and Diapheridae as its sister group.