Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
     Subclass Cymatosirophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004)
       Order Cymatosirales Round & R.M. Crawford (1990)
         Family Cymatosiraceae Hasle, Stosch & Syvertsen (1983)
           1 Genus Cymatosira Grunow (1862)
           2 Genus Campylosira Grunow (1881)
           3 Genus Plagiogrammopsis Hasle, Stosch & Syvertsen (1983)
           4 Genus Brockmanniella Hasle, Stosch & Syvertsen (1983)
           5 Genus Minutocellus
           6 Genus Leyanella Hasle, Stosch & Syvertsen (1983)
           7 Genus Arcocellulus Hasle, Stosch & Syvertsen (1983)
           8 Genus Papiliocellulus Hasle, Stosch & Syvertsen (1983)
           9 Genus Extubocellulus Hasle, Stosch & Syvertsen (1983)