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 Corethrophycidae Round & R.M. Crawford (1990)
         Order Corethrales Round & R.M. Crawford (1990)
           Family Corethraceae M. Lebour (1930)
             Genus Corethron Castrac. (1886)