Kingdom Protoctista Hogg, 1860 Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Class Coscinopiscophyceae see Class Coscinodiscophyceae Round & R.M. Crawford (1990) 5 Subclass Corethronophycidae see Subclass Corethrophycidae Round & R.M. Crawford (1990)