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)
       01 Order Chrysanthemodiscales Round (1990)
       02 Order Melosirales R.M. Crawford (1990)
       03 Order Paraliales R.M. Crawford (1990)
       04 Order Aulacoseirales R.M. Crawford (1990)
       05 Order Orthoseirales R.M. Crawford (1990)
       06 Order Coscinodiscales Round & R.M. Crawford (1990)
       07 Order Ethmodiscales Round (1990)
       08 Order Stictocyclales Round (1990)
       09 Order Asterolamprales Round & R.M. Crawford (1990)
       10 Order Arachnoidiscales Round (1990)
       11 Order Stictodiscales Round & R.M. Crawford (1990)