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