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 Biddulphiophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004)
         Order Eupodiscales see Order Triceratiales Round & R.M. Crawford (1990)
           Family Eupodiscaceae Ralfs (1861), nom. cons. see Family Triceratiaceae Lemmerm. (1899)
             1 Genus Pseudoauliscus
             2 Genus Eupodiscus Bailey (1851)
             3 Genus Auliscus Ehrenb. (1843)
             4 Genus Odontella C.Agardh (1832)
             5 Genus Triceratium Ehrenb. (1839)
             6 Genus Pleurosira (Menegh.) Trevar. (1848)
             7 Genus Cerataulus Ehrenb. (1843)