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 Cymbellales D.G.Mann (1990) Family Rhoicospheniaceae Chen & Zhu (1983) 1 Genus Rhoicosphenia Grunow (1860) 2 Genus Campylopyxis Medlin (1985) 3 Genus Cuneolus Giffen (1970)