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) Family Aulacosiraceae (R.M. Crawford, 1990) see Family Aulacoseiraceae R.M. Crawford (1990) Genus Aulacosira see Genus Aulacoseira Thwaites (1848)