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 Climacospheniales Round (1990)
         Family Climacospheniaceae Round (1990)
           1 Genus Climacosphenia Ehrenb. (1843)
           2 Genus Synedrosphenia (H. Perag.) Azpeitia (1911)