Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
   Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
     Clade Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837
       Informal Group Opisthobranchia Milne-Edwards, 1846 see Order Opisthobranchia Milne-Edwards, 1848
         Clade Nudipleura Wägele & Willan, 2000
           Subclade Nudibranchia Cuvier, 1814 see Order Nudibranchia Cuvier, 1814
             Clade Nudibranchia Dexiarchia Schrödl, Wägele & Willan, 2001
               Clade Cladobranchia Willan & Morton, 1984
                 Subclade Dendronotida Odhner, 1934
                   Superfamily Tritonioidea Lamarck, 1809
                     Family Tethydidae Rafinesque, 1815