Clade Sigmurethra Pilsbry 1900 (slug)
Parent taxon: Stylommatophora according to P. Bouchet et al. 2005
Sister taxa: Achatinina, Anastomopsidae, Clausiloidea, Cylindrellinidae, Grandipatulidae, Grangerellidae, Helicina, Limnophila, Palaeoxestinidae, Scalaxidae, Scolodontina
Subtaxa: none
Ecology: epifaunal
Distribution: found only at SC-210 (Eocene of Wyoming)