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 Nudibranchia Cuvier, 1814 - "true" nudibranchs
Suborder Doridina Odhner, 1934
Superfamily Anadoridoidea Vaught, 1989, nom. inval.
Family Vayssiereidae Thiele, 1931
see Family Okadaiidae Baba, 1930
Genus Okadaia Baba, 1930