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 Aeolidida Eliot, 1910
                   Superfamily Fionoidea Gray, 1857
                     1 Family Fionidae Alder & Hancock, 1855
                     2 Family Calmidae Iredale & O'Donoghue, 1923
                     3 Family Eubranchidae Odhner, 1934
                     4 Family Pseudovermidae Thiele, 1931
                     5 Family Tergipedidae Bergh, 1889