Division [Bacillariophyta] Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919) [Subdivision] Bacillariophytina Medlin & Kaczmarska (2004) see Subphylum Bacillariophytina Medlin & Kaczmarska (2004) Class Mediophyceae Medlin & Kaczmarska (2004) [paraphyletic] - bipolar centrics Order Thalassiosirales Glezer & I.V. Makarova (1986)