Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Fragilariophyceae Round (1990) - araphid, pennate diatoms see Class Bacillariophyceae Haeckel (1878)
     Subclass Fragilariophycidae Round (1990) - core araphid diatoms
       Order Tabellariales Round (1990)
         Family Tabellariaceae Kütz. (1844)
           1 Genus Tabellaria Ehrenb. ex Kütz. (1844)
           2 Genus Tetracyclus Ralfs (1843)
           3 Genus Oxyneis Round (1990) [monotypic]