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 Entopylales see Order Cyclophorales Round & R.M. Crawford (1990)
           Family Entopylaceae Grunow (1862)
             1 Genus Entopyla Ehrenb. (1848)
             2 Genus Gephyria Arnott (1858)