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
(Achatinid Sigmurethra)
Suborder Sigmurethra Pilsbry, 1900
see Group Sigmurethra Pilsbry, 1900
Superfamily Streptaxoidea Gray, 1860 [monotypic]
Family Streptaxidae Gray, 1860
Genus Rillya Munier-Chalmas, 1883