Kingdom Protoctista Hogg, 1860 Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Subclass Coscinodiscophycidae Round & R.M. Crawford (1990) Order Aulacosirales (R.M. Crawford, 1990) see Order Aulacoseirales R.M. Crawford (1990) 1 Family Aulacosiraceae (R.M. Crawford, 1990) see Family Aulacoseiraceae R.M. Crawford (1990)