Kingdom Protoctista Hogg, 1860 Count: [p] 36p;91c;87o;183f;507g;35s;2v Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Count: [f] 4c;41o;83f;204g Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Count: 20o;33f;85g Subclass Coscinodiscophycidae Round & R.M. Crawford (1990) Count: [f] 9o;16f;23g Order Melosirales R.M. Crawford (1990) Count: [f] 4f;6g Family Stephanopyxidaceae Nikolaev (1984) Count: 1g Genus Stephanopyxis (Ehrenb.) Ehrenb. (1845) Count: -