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Helicina
	Truncatellina cylindrica
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subcohort:	Panpulmonata
Superorder:	Eupulmonata
Order:	Stylommatophora
Suborder:	Helicina; Rafinesque, 1815

After excluding groups not related, the informal group Sigmurethra has become the suborder Helicina, with the following infraorders and a collection of families with no superfamily:^[1]^[2]

Suborder Helicina ("Non-Achatinoid Clade")
- Infraorder Arionoidei
- Infraorder Clausilioidei
- Infraorder Helicoidei: formed from Helicoidea Rafinesque, 1815 and Sagdoidea Pilsbry, 1895^[3]
- Infraorder Limacoidei: formed from original limacoid clade
- Infraorder Oleacinoidei^[4]
  - Oleacinoidea: formed from original Testacelloidea but with the family Testacellidae excluded;
  - Haplotrematoidea: formed from original Rhytidoidea and Haplotrematidae^[5]
- Infraorder Orthalicoidei
- Infraorder Pupilloidei (Orthurethra)
- Infraorder Rhytidoidei: formed by Rhytidoidea merging with contents from Acavoidea.
- Infraorder Succineoidei (Elasmognatha)
- Infraorder Helicina (temporary name)

References

^ MolluscaBase eds. (2020). MolluscaBase. Helicina. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=994701 on 2020-08-25
^ Bouchet, Philippe; Rocroi, Jean-Pierre; Hausdorf, Bernhard; Kaim, Andrzej; Kano, Yasunori; Nützel, Alexander; Parkhaev, Pavel; Schrödl, Michael; Strong, Ellen E. (2017). "Revised Classification, Nomenclator and Typification of Gastropod and Monoplacophoran Families". Malacologia. 61 (1–2): 1–526. doi:10.4002/040.061.0201. ISSN 0076-2997. S2CID 91051256.
^ Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2018). "Helicoidei". MolluscaBase. World Register of Marine Species. Retrieved 2018-08-01.
^ Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2018). "Oleacinoidei". MolluscaBase. World Register of Marine Species. Retrieved 2018-08-01.
^ Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2018). "Haplotrematoidea H.B. Baker, 1925". MolluscaBase. World Register of Marine Species. Retrieved 2018-08-01.