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 Dendronotina Odhner, 1934 [monotypic]
           Superfamily Dendronotoidea Sars, 1878 see Superfamily Tritonioidea Lamarck, 1809
             Family Tethyidae Gill, 1871, orth. inval. see Family Tethydidae Rafinesque, 1815
               1 Genus Tethys Linnaeus, 1767, nom. cons.
               2 Genus Melibe Rang, 1829
               3 Genus Propemelibe Allan, 1932