Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
     Subclass Chaetocerotophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004)
       Order Chaetocerotales Round & R.M. Crawford (1990)
         Family Chaetocerotaceae Ralfs (1861)
           1 Genus Chaetoceros Ehrenb. (1844)
           2 Genus Gonioceros H. Perag. & Perag. (1907)
           3 Genus Bacteriastrum Shadbolt (1854)