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 Stictocyclales Round (1990) Family Stictocyclaceae Round (1978) Genus Stictocyclusᵀ A. Mann (1925)