Infraorder Helicoidei (slug)
Parent taxon: Helicina according to P. Bouchet et al. 2017
Sister taxa: Arionoidei, Clausilioidei, Limacoidei, Oleacinoidei, Orthalicoidei, Plectopyloidea, Punctoidea, Pupilloidei, Rhytididae, Rhytidoidei, Succineoidei, Testacelloidea, Urocoptoidea
Subtaxa: Helicoidea Sagdoidea
Ecology: epifaunal