Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919) Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Subclass Coscinodiscophycidae Round & R.M. Crawford (1990) Order Chrysanthemodiscales Round (1990) Family Chrysanthemodiscaceae Round (1978) 1 Genus Chrysanthemodiscus A. Mann (1925)