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 Naviculineae (Bessey) Hendey (1937) Family Pleurosigmataceae Mereschk. (1903) 1 Genus Pleurosigma W.Sm. (1852) 2 Genus Toxonidea Donkin (1858) 3 Genus Donkinia Ralfs (1861) 4 Genus Gyrosigma Hassall (1845) 5 Genus Rhoicosigma Grunow (1867)