Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs
see Order Opisthobranchia Milne-Edwards, 1848
Order Acochlidioidea Küthe, 1935 [monotypic]
see Order Acochlidia Odhner, 1937
Superfamily Euacochlidioidea nom. inval.
Family Tantulidae Rankin, 1979 [monotypic]
1 Genus Antulum Millard, 1996, orth. inval.
see Genus Tantulum Rankin, 1979