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 Fragilariales P.C.Silva (1962)
         Family Fragilariaceae Grev. (1833)
           01 Genus Fragilaria Lyngb. (1819)
           02 Genus Centronella Max Voigt (1902)
           03 Genus Asterionella Hassall (1850)
           04 Genus Staurosirella D.M. Williams & Round (1987)
           05 Genus Staurosira (Ehrenb.) D.M. Williams & Round (1987)
           06 Genus Pseudostaurosira (Grunow) D.M. Williams & Round (1987)
           07 Genus Punctastriata D.M. Williams & Round (1987)
           08 Genus Fragilariaforma see Genus Fragilariforma D.M. Williams & F.E. Round (1988)
           09 Genus Martyana Round (1990) [monotypic]
           10 Genus Diatoma Bory (1824)
           11 Genus Hannaea R.M. Patrick (1966)
           12 Genus Meridion C.Agardh (1824)
           13 Genus Synedra Ehrenb. (1830)
           14 Genus Ctenophora (Grunow) Williams & Round (1986)
           15 Genus Neosynedra D.M. Williams & Round (1986)
           16 Genus Tabularia (Kütz.) D.M. Williams & Round (1986)
           17 Genus Catacombas D.M. Williams & Round (1986)
           18 Genus Hyalosynedra D.M. Williams & Round (1986)
           19 Genus Opephora P. Petit (1888)
           20 Genus Trachysphenia P. Petit (1877)
           21 Genus Thalassioneis Round (1990) [monotypic]
           22 Genus Falcula
           23 Genus Pteroncola R.W. Holmes & Croll (1984)
           24 Genus Asterionellopsis Round (1990)
           25 Genus Bleakeleya Round (1990) [monotypic]
           26 Genus Podocystis Bailey (1854)