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 Goniaeolididae Odhner, 1907 [monotypic]
               1 Genus Goniaeolis Sars, 1861