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 Arminina Odhner, 1934
           Superfamily Metarminoidea Odhner, 1968, nom. inval.
             Family Zephyrinidae Iredale & O'Donoghue, 1923 see Family Proctonotidae Gray, 1853
               Genus Caldukia Burn & Miller, 1969