Kingdom Protoctista Hogg, 1860 Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Class Bacillariophyceae Haeckel (1878) - pennates Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms Order Epithemiales see Order Rhopalodiales D.G.Mann (1990) 1 Family Epithemiaceae see Family Rhopalodiaceae (Karsten) Topachevs'kyj & Oksiyuk (1960) 2 Family Entomoneidaceae Reimer (1975) 3 Family Auriculaceae Hendey (1964)