Gastropoda
      Heterobranchia
            Pulmonata
                  Stylommatophora
                              Helicoidea
                                    Bradybaenidae
                                    Camaenidae
                                    Cochlicellidae
                                    Elonidae
                                    Epiphragmophoridae
                                    Helicidae
                                    Helminthoglyptidae
                                    Hygromiidae
                                    Oreohelicidae
                                    Pleurodontidae