†infraclass Euthyneura Spengel 1881 (snail)
Parent taxon: Heterobranchia according to P. Bouchet et al. 2017
See also Martin 1904, Sohl 1964, Squires 1984, Squires 1987 and Ward and Blackwelder 1987
Sister taxa: Allogastropoda, Anomalorbis, Palaeoalvania, Stuoraxidae, Architectonicoidea, Valvatoidea, Architectibranchia, Streptacidoidea, Misurinella, Nerineoidea
Subtaxa: Acteonimorpha Pyramidelloida Ringipleura Tectipleura
Ecology: epifaunal