Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
     Subclass Coscinodiscophycidae Round & R.M. Crawford (1990)
       Order Coscinodiscales Round & R.M. Crawford (1990)
         Family Heliopeltaceae H.L. Sm. (1872)
           1 Genus Actinoptychus Ehrenb. (1839)
           2 Genus Glorioptychus Hanna (1927)
           3 Genus Lepidodiscus O.N. Witt (1886)