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 Orthalicoidea Martens, 1860
Family Megaspiridae Pilsbry, 1904
1 Genus Megaspira Lea, 1835
2 Genus Callionepion Pilsbry & Vanatta, 1899
3 Genus Palaeostoa Andreae, 1884