Division [Bacillariophyta] Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   [Subdivision] Bacillariophytina Medlin & Kaczmarska (2004) see Subphylum Bacillariophytina Medlin & Kaczmarska (2004)
     1 Class Mediophyceae Medlin & Kaczmarska (2004) [paraphyletic] - bipolar centrics
     1.n Class Bacillariophyceae Haeckel (1878) - pennates