Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics
     Subclass Coscinodiscophycidae Round & R.M. Crawford (1990)
       Order Melosirales R.M. Crawford (1990)
         Family Melosiraceae Kütz. (1844)
           1 Genus Melosiraᵀ C.Agardh (1824)
           2 Genus Druridgea