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
Suborder Architaenioglossa Haller, 1890
Superfamily Cyclophoroidea Gray, 1847
Family Cyclophoridae Gray, 1847
Subfamily Cyclophorinae Gray, 1847
Genus Cyclotus Guilding, 1840
Subgenus Opisthoporus Benson, 1851