Sacoglossa Ihering, 1876 - sacoglossans
   Suborder Plakobranchacea Jensen, 1996 - non-shelled sacoglossans
     Superfamily Plakobranchoidea Gray, 1840
       Family Plakobranchidae Gray, 1840
         1 Genus Elysia Risso, 1818
         2 Genus Thuridilla Bergh, 1872
         3 Genus Placobranchus Boïé, 1824, orth. inval. see Genus Plakobranchus van Hasselt, 1824
         4 Genus Elysiella
         5 Genus Tridachia Deshayes, 1857
         6 Genus Tridachiella McFarland, 1924
         7 Genus Pattyclaya Marcus, 1982