Division [Bacillariophyta] Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919) [Subdivision] Coscinodiscophytina Medlin & Kaczmarska (2004) [monotypic] see Subphylum Coscinodiscophytina Medlin & Kaczmarska (2004) Class Coscinodiscophyceae Round & R.M. Crawford (1990) [paraphyletic] - radial centrics Order Leptocylindrales Round & R.M. Crawford (1990)