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 Helicoidea Rafinesque, 1815 Family Bradybaenidae Pilsbry, 1934 (1898) 1 Subfamily Bradybaeninae Pilsbry, 1934 (1898) 2 Subfamily Helicostylinae Ihering, 1909