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) Family Epithemiaceae see Family Rhopalodiaceae (Karsten) Topachevs'kyj & Oksiyuk (1960) Genus Rhopalodia O.Müll. (1895)