Testacelloidea

The Testacelloidea are a superfamily of air-breathing land snails and slugs, terrestrial gastropod molluscs in the suborder Helicina of the order Stylommatophora.

Taxonomy
The families within the Testacelloidea are as follows: This taxonomy was based on the study by Nordsieck, published in 1986, and the publication by Schileyko in 2000.
 * Family Testacellidae Gray, 1840

The following families, previously categorized within the Testacelloidea, were transferred to the superfamily Oleacinoidea H. Adams & A. Adams, 1855 in 2017.
 * Family Oleacinidae H. Adams & A. Adams, 1855
 * Family Spiraxidae H. B. Baker, 1939