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
Suborder Orthurethra Pilsbry, 1900
Superfamily Cochlicopoidea Pilsbry, 1900 (1879)
Family Amastridae Pilsbry, 1910
Genus Leptachatina Gould, 1847
Subgenus Thaanumia Ancey, 1899