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 1 Subclass Coscinodiscophycidae Round & R.M. Crawford (1990) Count: [f] 9o;16f;23g 2 Subclass Chaetocerophycidae see Subclass Chaetocerotophycidae Round & R.M. Crawford (1990) Count: [f] 2o;2f;3g 3 Subclass Rhizosoleniophycidae Round & R.M. Crawford (1990) Count: [f] 1o;3f;10g 4 Subclass Lithodesmiophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004) Count: [f] 1o;2f;5g 5 Subclass Biddulphiophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004) Count: [f] 4o;4f;23g 6 Subclass Thalassiosirophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004) Count: [f] 1o;4f;11g 7 Subclass Corethrophycidae Round & R.M. Crawford (1990) Count: [f] 1o;1f;1g 8 Subclass Cymatosirophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004) Count: [f] 1o;1f;9g