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 Rhopalodiales D.G.Mann (1990) Family Rhopalodiaceae (Karsten) Topachevs'kyj & Oksiyuk (1960) Genus Protokeelia