Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919) Subdivision Bacillariophytina Medlin & Kaczmarska (2004) see Subphylum Bacillariophytina Medlin & Kaczmarska (2004) Class Bacillariophyceae Haeckel (1878) - pennates Order Achnanthales P.C.Silva (1962)