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 Lyrellales D.G.Mann (1990) Family Lyrellaceae D.G.Mann (1990) Genus Petroneis Stickle & D.G.Mann (1990) Petroneis arabica (Grunow ex A.Schmidt) D.G.Mann (1990)