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 Neotaenioglossa Haller, 1882
see Order Sorbeoconcha Ponder & Lindberg, 1997
Superfamily Vanikoroidea Gray, 1840
Family Fossaridae Adams, 1860
see Subfamily Fossarinae Adams, 1860
1 Genus Fossarus Philippi, 1841
2 Genus Chilkaia Preston, 1915
3 Genus Constantia Adams, 1860
4 Genus Medioriopsis Millard, 1996, orth. inval.
see Genus Medoriopsis Cossmann, 1888
5 Genus Vouastia Raspail, 1909