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 Sacoglossa Ihering, 1876 - sacoglossans
         Suborder Tamanovalvina
           Superfamily Julioidea see Superfamily Oxynooidea Stoliczka, 1868 (1847)
             Family Elysiidae Forbes & Hanley, 1851 see Family Placobranchidae Gray, 1840, orth. inval.
               1 Genus Elysia Risso, 1818
               2 Genus Elysiobranchus Pruvot-Fol, 1930
               3 Genus Pattyclaya Marcus, 1982
               4 Genus Plakobranchus van Hasselt, 1824
               5 Genus Thuridilla Bergh, 1872