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 Aeolidiina Eliot, 1910
           Superfamily Euaeolidioidea Odhner, 1968, nom. inval.
             01 Family Notaeolidiidae Eliot, 1910 [monotypic]
             02 Family Nossidae Odhner, 1968, nom. illeg. [monotypic] see Family Flabellinidae Bergh, 1889
             03 Family Flabellinidae Bergh, 1889
             04 Family Protoaeolidiellidae Vaught, 1989, orth. inval. [monotypic] see Family Protaeolidiellidae Odhner, 1968
             05 Family Pleurolidiidae Burn, 1966 [monotypic] see Family Aeolidiidae Gray, 1827
             06 Family Eubranchidae Odhner, 1934
             07 Family Pseudovermidae Thiele, 1931 [monotypic]
             08 Family Tergipedidae Bergh, 1889
             09 Family Fionidae Alder & Hancock, 1855 [monotypic]
             10 Family Calmidae Iredale & O'Donoghue, 1923 [monotypic]
             11 Family Glaucidae Gray, 1827, nom. protect.
             12 Family Facelinidae Bergh, 1889
             13 Family Aeolidiidae Gray, 1827
             14 Family Myrrhinidae Bergh, 1905 [monotypic] see Subfamily Favorininae Bergh, 1889
             15 Family Piseinotecidae Edmunds, 1970 [monotypic]