Kingdom Protoctista Hogg, 1860
   Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844)
     Class Fragilariophyceae Round (1990) - araphid, pennate diatoms see Class Bacillariophyceae Haeckel (1878)
       Subclass Fragilariophycidae Round (1990) - core araphid diatoms
         Order Fragilariales P.C.Silva (1962)
           Family Fragilariaceae Grev. (1833)
             1 Genus Asterionellopsis Round (1990)
             2 Genus Diatoma Bory (1824)
             3 Genus Fragilaria Lyngb. (1819)
             4 Genus Synedra Ehrenb. (1830)
             5 Genus Ceratoneis Ehrenb. (1839)
             6 Genus Centronella Max Voigt (1902)
             7 Genus Asterionella Hassall (1850)
             8 Genus Opephora P. Petit (1888)
             9 Genus Meridion C.Agardh (1824)