Phylum Mollusca Linnaeus, 1758 - molluscs Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Divasibranchia Minichev & Starobogatov, 1975 Order Stylommatophora Schmidt, 1855 see Infraorder Stylommatophora Schmidt, 1855 (Helicid Sigmurethra) Superfamily Vitrinoidea Fitzinger, 1833 see Superfamily Limacoidea Batsch, 1789 Family Vitrinidae Fitzinger, 1833 Genus Provitrina Wenz, 1919