living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         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 Aeolidoidea see Suborder Aeolidina Odhner, 1934
                   Superfamily Pleuroprocta Odhner, 1939 see Superfamily Flabellinoidea Bergh, 1889
                     1 Family Notaeolidiidae Eliot, 1910
                     2 Family Coryphellidae Bergh, 1889 see Family Flabellinidae Bergh, 1889
                     3 Family Nossidae Odhner, 1968, nom. illeg. see Family Flabellinidae Bergh, 1889
                     4 Family Flabellinidae Bergh, 1889
                     5 Family Protaeolidiellidae Odhner, 1968 see Family Aeolidiidae Gray, 1827
                     6 Family Pleurolidiidae Burn, 1966 see Family Aeolidiidae Gray, 1827