Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919) Class Bacillariophyceae Haeckel (1878) - pennates Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms Order Naviculales Bessey (1907) Suborder Sellaphorineae D.G.Mann (1990) 1 Family Sellaphoraceae Mereschk. (1902) 2 Family Pinnulariaceae D.G.Mann (1990)