The Testacelloidea are a superfamily of air-breathing land snails and slugs, terrestrial gastropod mollusks in the suborder Helicina of the order Stylommatophora .[1] [2]

Drawing of the shelled slug, Testacella haliotidea
Scientific classification

Gray, 1840
See text


The families within the Testacelloidea are as follows:[1]

This taxonomy was based on the study by Nordsieck, published in 1986,[3] and the publication by Schileyko in 2000.[4]

The following families, previously categorized within the Testacelloidea,were in 2017 transferred to the superfamily Oleacinoidea H. Adams & A. Adams, 1855 [5]


  1. Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. Hackenheim, Germany: ConchBooks. 47 (1–2): 1–397. ISBN 3-925919-72-4. ISSN 0076-2997.
  2. MolluscaBase eds. (2020). MolluscaBase. Testacelloidea Gray, 1840. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=933883 on 2020-11-09
  3. H. Nordsieck (1986). "The system of the Stylommatophora (Gastropoda), with special regard to the systematic position of the Clausiliidae, II. Importance of the shell and distribution". Archiv für Molluskenkunde. 117 (1–3): 93–116.
  4. A.A. Schileyko (1998–2003). "Treatise on recent terrestrial pulmonate molluscs". Ruthenica. suppl. 2: 1–1626.
  5. Bouchet P., Rocroi J.P., Hausdorf B., Kaim A., Kano Y., Nützel A., Parkhaev P., Schrödl M. & Strong E.E. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61(1-2): 1-526