Helicina is a suborder of land gastropods which consists of former members of the informal group Sigmurethra which were proven to make a clade. It encompasses the following infraorders along with a collection of families with no superfamily: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 Suborder Helicina ("Non-Achatinoid Clade") Infraorder Arionoidei Infraorder Clausilioidei Infraorder Helicoidei: formed from Helicoidea and Sagdoidea Infraorder Limacoidei: formed from original limacoid clade Infraorder Oleacinoidei Oleacinoidea: formed from original Testacelloidea but with the family Testacellidae excluded; Haplotrematoidea: formed from original Rhytidoidea and Haplotrematidae Infraorder Orthalicoidei Infraorder Pupilloidei (Orthurethra) Infraorder Rhytidoidei: formed by Rhytidoidea merging with contents from Acavoidea. Infraorder Succineoidei (Elasmognatha) Infraorder Helicina (temporary name)
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