Protoctista Hogg, 1860
   Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844)
     Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
       Coscinodiscophycidae Round & R.M. Crawford (1990)
         Asterolamprales Round & R.M. Crawford (1990)
           Asterolampraceae H.L. Sm. (1872)
             Asterolampra Ehrenb. (1845)