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) - bipolar centrics Order Biddulphiales Willi Krieg. (1954)