Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs
see Class Gastropoda Cuvier, 1795
Order Caenogastropoda Cox, 1960
see Superorder Caenogastropoda Cox, 1960
Superfamily Rissooidea Gray, 1847
Family Adeorbidae Monterosato, 1884 [monotypic]
see Subfamily Torninae Sacco, 1896 (1884)
Subfamily Adeorbinae Monterosato, 1884 [monotypic]
Genus Circulus Jeffreys, 1865
Subgenus Ponocyclus Pilsbry, 1953